Well, yeah. Because that isn't a question about the law.

Surely that subreddit might know of any AIs that don't use copyright incompatible training data and / or weights. What other places could I ask?

Surely not - the only thing they purport to know is legal advice and you asked something that wasn't even tangentially related to the law.

I'd want to try AI for coding, but I want to use a software license compatible with all it's training data and weights software licenses and attribute copyright to all the training data's authors, because I don't believe the copywashing from AI companies. No explanation was given for the post's removal.

Go ahead and downvote me, AI company lawyers.