I did a lot of work on the community at Quora and my low-effort hot take is that subject matter experts don't get paid enough to do that kind of work, so you ge

I did a lot of work on the community at Quora and my low-effort hot take is that subject matter experts don't get paid enough to do that kind of work, so you get grad students or hobbyists who put in effort while they are unemployed, but fizzle off when not, and they boil away leaving only the obsessive folks with an axe to grind. That's a problem to solve as well, but I think it could be solved if those subject matter experts were part of your business model and they were paid in some meaningful way.