I don’t mind sharing things. I’m pretty sure that none of my ideas are completely original anyways. And we’ve all gotten our ideas from other people. Just look at all the isekai novels, tons of them are basically identical, just with slight tweaks to the same premise, if even that. So unless someone is stealing my ideas literally word for word (like basically importing a character of mine or copying a setting outright) I don’t mind it if someone copies me. We wouldn’t have genres if people didn’t copy what they liked, it’s inevitable. For good stories, yes novel things and new kinds of systems are nice and good, but what makes a story is the story. The best magic system in the world won’t ever save a trainwreck, and you can’t just copy good writing unless you’re good at writing.
I also like bouncing ideas with people. I’ve gotten some insight from discord channels on how to solve worldbuilding problems that I wouldn’t have gotten otherwise. I never post entire unwritten stories, though. If I’m asking, after all, it’s probably because I plan to write that story at some point and don’t want to release spoilers.