itch.io

Why do you keep asking about scripts? That isn't the problem. The problem is how your mailing systems currently operate. No one should be subjected to mailing spam if they decided to add alot of games to their library. Doesn't matter if it was done by a script or done manually.

In my case everything was done manually.

Whether or not someone used a third party script is outside the issue. It's the website/service that is the problem.
Opting out of these emails shouldn't be more complicated than changing a notification setting. It's ridiculous that the service's "solution" is to exclude the games we purchased from our library in order to not be spammed by tons of unwanted emails.

Yeah, I really have to agree with everyone else; running a script has nothing to do with it.  You're trying to deflect the issue by implying that using a script caused this to happen.

The same thing would be happening to someone who went, one by one, adding the same items to their library by hand.  You should really stop trying to scapegoat something that has no bearing on the situation.  It makes you (or itch, assuming this is something they're specifically directing you to say) look foolish.