As a read-only SO user - thank you for your answers!

Fourth panel as well, with those bots collecting data for AI training that don’t respect your robots.txt, change user agents and overload your servers

And they aren’t paying per compute time. Rent-free, always.

Too risky. Who knows what’s hiding in their code. Might be some copylefted library or a piece of code that’s been copy-pasted into the project without fully complying with the copyleft requirements. Making sure this isn’t the case and/or cleaning up an abandoned project can be costly and complicated. Easier for them to just kill it.