Where all the Deponia keys come from?

You know there is something like bundles? Or off for those, who own a title? Many games does that. You own game X, You can buy game Y for lowered price. Ori and Dark Souls made that. And both old versions of the game are impossible to buy. However it's bad for Dark Souls, cause it IS different game and it's online. So if You are playing PtD, You can't play with newcomers, cause they won't buy game that is removed from store. That's bad.

But Deponia could have made pack out of those 3 games with a off, when You own a game. That's the case of MOST of the games. Why they couldn't have done that? That's the mystery.

So they should have NOT made different game, just make pack of them three.And the problem is fixed.

Ori and the Blind forest with removing old game and make new game.
Or just any pack on Steam that have off when You own a title of it.
Whatever. There is tons of options, and I listed just two of the most popular and easy to do. But they couldn't even manage to list what games are in the complete journey. They failed so bad.

Ori Base
Ori with DLC
You can't buy base game anymore. Yet the Definitive version was set to the same price and whoever owned base game, had the price cut of 50%.

Dark Souls PtD
Dark Souls Remastered
The same case, but this is remastered, different game. Which is actually bad, cause of what I said before.

Assassin's Creed Bundle
Bundle that contains few games of the series. Not listed as a different game for no reason.

If those studios could have done that, they could and should have too.

4 Deponia games exist, one is not part of the trilogy (that means 3, just in case), then what does it contain? Not exactly the riddle of the year.

Don't be a smartass. Many games are not sold on Steam. And Steam didn't have description that listed those games.
Why should I google collection, that should have listed games in its description. It's their DUTY to say what the pack contains. And why would I even want to google it if I was sure this is a bundle that contains VERY DIFFERENT games than the other 4. Because that's what every intelligent person would think. That's the point - every one would think we have 4 games + pack of other games that are not sold separately. This is how they make it look like. For me it's intentional to make people buy games twice. It's pretty uncool.

It is a remastered version of the 3 games with heaps of additional content and features, as it is written in the store page.

In a store page not much is written. And no, they never said "it's a remastered version of Deponia, Chaos on(...)'. Never. So the normal reaction is - some pack of probably the oldest games, that maybe were not on PC or whatever. I'm not the clairvoyant, so I didn't know those games are the same games. How would I know if they never said it is.

It's not billing two times for the same things, but offering the option to buy the original games one by one, or the full package as a trilogy pack. You as a hopefully adult person, you are responsible for what you buy. You don't seem to be an incompetent consumer who feels victimized, that they about the difficulty that you can't just blindly buy everything, they need to think first. So don't act like one?

Once again, don't be a smartass. If insulting is the only thing You can do, even though You are pretty wrong, this is the case for You, maybe You should start acting like an adult. Cause You are clearly acting like in a kindergarten and You don't like one kid, so You are mean to them.
I already showed how they could and should have made it. Any other studio does that. Why this one fails?

Are you angry about Lord of the Rings selling books and DVDs one by one, and in trilogy packs too?

First, I am not angry. It's clearly You who are fanboy and couldn't stand a criticizm, that is very legit.
Second, this is the case! They are selling BUNDLE of the movies, which Deponia's makers couldn't make. But as the DVD is physical copy, not a digital, it can't offer off for what You already have. I hope You understand that simple thing. They never offered a pack. They offered a one game, sold as different one, instead of saying it's the trilogy of those specific titles.

I may not understand you and your incompetent anger, but you have trouble understanding written information, and refuse to think for yourself. I'm not sure if you just enjoy the outrage, or this is what you are capable of. Anyway, better luck with your errands in the future.

It's You who can't stand the truth and criticizm and You who is mad that someone dared to say something You don't understand. So don't turn this against me. Cause this is You who is incompetent here and pretty much aggressive towards me. You can't understand simple things as bundles in digital distribution. You are trying to lie how they say it's a trilogy of those games, while they never specify that this is it.

So either You start being grown up, or don't reply to me in that way. This is what makes You NOT an adult. The hostility because someone said something.