Re: AIX. Why won't IBM pay for it? For example, from the case I know, IBM is paying for AIX support for Rust. I would think PostgreSQL deserves the same.
After it was dropped from PostgreSQL, a team from IBM showed up on the mailing list (see one of my other answers for link), so perhaps that is now going to happen! I think it's a case that they were using it, but didn't realise that the project was on the verge of dropping it for years due to lack of interested maintainer & resources. Open source is funny like that. Deleting it was certainly one way to get their attention.