Peaked in 2014. That coincides with my experience. Something went wrong:

* Moderation went bad. I stopped moderating/flagging after it was deemed unhelpful?! I know it's hard to moderate a platform like that, but giving me a slap in the face when I volunteer my valuable time is not the way to do it.

* Questions closed because they weren't "programming questions", but obviously about tools devs use every day. Again and again, they were the TOP google results. You'd click on it and found a old question closed because it was considered off topic. As a business, you seriously need to ask yourself some hard questions when you fend off users like that.

Yeah, I used to mostly answer there instead of ask and was in the top % for several big tags whatever that means / is worth, but then at some point I realized things had changed and I was spending more time fighting rules and guidelines rather than sharing knowledge and having a good time so I just stopped.