SO is a shithole, just like Reddit. All the work is done by volunteers. When it was time to cash out with the platform, they also did several things to fuck with their community. I’ve contributed quite a bit to the trilogy sites, and served as a moderator. I regret every second of it. But at least a few people got rich in the process.
I don’t really have any Insights into Quora. I know StackExchange hardliner always joked about the site and felt like SE is better. I joined that because I thought it was fun to feel superior, but I don’t even have an account on that site