It's not Wikipedia, right? Getting the maximum number of contributors isn't a stated goal? I'm a C programmer with a fair bit of kernel experience, and they don't want me, I'm pretty sure, and I'm completely fine with that.
Wikipedia has plenty of gatekeeping too. I once had to submit a single edit three times before the moderators safeguarding the article begrudgingly accepted it.
Different Wikipedia communities have different governance policies. In the math wikis there's generally a rule that small fixes are not allowed. This stops people from arguing whether slightly better explained sentences are the right edits.