Looks like SO was already dying since 2017.
I think other helpful places like reddit, discord, web forums etc might be what hit SO 2014-15 onwards.
AI seems to have given it a blow of mercy to end the misery.
for a lot of stuff it just made more sense to ask on the github project's issue tracker.
The graph shows questions, at some point they saturate, 90% of the stuff is answered. New frameworks contribute to the majority of the new questions.