Why on earth would you force stuff on a party that has said they don't want that?
If I want to use an auto-complete then I can, and I will? Restricting that is as regressive as a project trying to specify that I write code from a specific country or… standing on my head.
Sure, if they want me to add a “I’m writing this standing on my head” message in the PR then I will… but I’m not.
Restricting this is their right, and it is not for you to attempt to overrule that right. Besides the fact that you do not oversee the consequences it also makes you an asshole.
They're not asking for you to write standing on your head, they are asking for you to author your contributions yourself.
Except they don’t, won’t and can’t control that: the very request is insulting.
I’ll make a change any way I choose, upright, sideways, using AI. My choice. Not theirs.
Their choice is to accept it or reject it based purely on the change itself, because that’s all there is.