Why is there loads of Clickteam Fusion 2.5 giveaways?

It's 1$ in the fanatical star deal.

Fail to see your point here. It's about €80, so let's say $100 on Steam right now, so the real CV gotten will be $10-15, for the real cost of roughly $1. This means you are getting roughly 10x-15x the real CV for each real dollar spent, which is an incredibly common way to raise CV (buying unbundled games at ~90% off yields almost the same and is not even efficient). Buying tons of cheap bundles at other sites can raise you the same amount of CV per dollar and even spread it across numbers. Not to mention that after the 5th giveaway of the same game, value starts decreasing rapidly.
So I really don't see how you can argue that particular giveaway is worthy of a blacklist, in which case you might as well go around and blacklist everyone who buys cheap bundles and give them away here as the end result is the same.