It’s not worth the time. You will spend uncountable hours of (unpaid) extremely exhausting labour talking to people who only care about solving their personal super specific problems. This is true for 90%+, there are exceptions but they are exceedingly rare

Trust me I tried many many times.

This has nothing to do with Google being evil it’s just one of the realities of maintaining a big open source project.

I'll add that for small projects, (and I suppose large ones) it's also a "unwelcome" task. Kinda like docs is.

Open Source projects are typically done by people who like coding. Writing docs, reviewing PRs, "management" are all chores, not fun parts of the project.

I manage a couple of projects that get submissions. Handling that is really not the fun part of my day. Fortunately I get very few. I can understand why ones that get a lot see it as a burden, not as the great gift the submitter thinks it is.

Personally I don't want to spend hours each day reviewing PRs. That's not what I signed up for.