Probably OP meant that they are ubiquitous in Enterprise settings, no that they're part of "EE Java".

Yeah, they are "jakarta EE" now. Or what do you mean?

Spring has some compatibility shims for EE but my understanding is it’s always been its own thing and was originally formed in reaction to EE

Spring is not „jackarta EE“, it’s compatible with some of EE specs (a good thing), but otherwise it’s just a different framework.

Spring is neither Java EE or Jakarta EE. It can integrate with those frameworks, but it's a completely independent system.