Changes for Unresponsive Winners

This is assuming the key doesn't work or there's a problem from the gifter's side.
How often does that actually happen?
Very few, especially compared to the overwhelming number of winners not claiming their wins fast enough.
For these fewer instances, a ticket to unfreeze their account would suffice then.

No point has been missed.
Maybe you're unaware that the bot problem has been raised a lot, repeatedly, by many, many users, for years (check older Suggestions threads), to no avail from the site runners.
Now suggestions focus on what can be done (i.e. accepted by the site runners) rather than what is ideal or you dream of doing.

Too tired and at this point, no longer willing to help out by listing them all.

But there are several concerns the community keeps bringing up for months and years now. When the concerns are voiced by a big part of the community, by longtime members and are mentioned again and again and again, those are valid points.

On the contrary we always get topics created where only a few users want something to change and within a few days those threads get buried and the topic never gets brought up again. Those are also things some people want to change, but I don't consider them valid and CG should not focus on them.

I don't see a possible abuse scenario because the gifter have no control about if the winner try to reveal a key or if he don't look at it for 7 days.

And only in the cases that the winner not checked the key for 7 days it would grant a automatic reroll, which would anyway granted, as soon as the mods would see the reroll ticket now with the updated rule.

All other reroll request cases with a revealed key, would still need a moderator to look into it.

For me it looks like "lesser work for the mods" and no abuse possibility.

Gifts on steam or giftlinks are a other thing that need to be excluded from the automatic reroll granting and still need a mod in each case.

You're right. I didn't think about it enough. I thought restarting the 7 day timer if they changed the key would prevent abuse, but I didn't think about the creator putting something fake in the key field and waiting for the 7 days to get a new winner. I don't see any way to prevent that without Steam giving the ability to check keys to see what game it is for and if it has been used.

Edit: This is wrong, this actually wouldn't allow for giveaway creator abuse because the automatic reroll process was only ever meant for when the winner doesn't ever look at the key over the 7 days.

Actually, I don't see how this could allow for abuse by giveaway creators. This automatic reroll conversation started in the other thread specifically for winners that are not viewing the key in the 7 day period. That was one of the things I originally mentioned in the comment I linked above. Only if the winner has not viewed the key after it has been sent for 7 days would this reroll button activate that allows you to get a new winner without waiting on a support ticket. If they don't care about their win enough to look at it in 7 days, we should be able to get a reroll, and if they never viewed the key, there is no reason support needs to be involved.

If the winner views the key, then the automatic reroll button is disabled and it goes back to support needing to approve the reroll. It is similar to how deleting and active giveaway is approved automatically and doesn't require support.