Over the past one and a half years, Stack Overflow has lost around 50% of its traffic. This decline is similarly reflected in site usage, with approximately a 50% decrease in the number of questions and answers, as well as the number of votes these posts receive.
The charts below show the usage represented by a moving average of 49 days.
What happened?
Yeah, this is what they get and deserve. They rose by providing meaningful, helpful, and technically adept answers to questions. Then they encouraged an abusive moderator culture that marks questions as duplicate, linking to unrelated questions. They also still do not offer easy ways for the knowledge base to be updated as things over time change. Now the company abusing their abusive moderators, causing them to basically go on strike right now.
Here’s hoping the next thing doesn’t suck as much ass as Stack Exchange ultimately has.
https://en.m.wikipedia.org/wiki/Fediverse
Based on that, there is no “q&a” type of Fediverse software (a clear answer and a clear “voted best” answer).
Stack overflow had a huge number of “mod tools” to help curate the content (gold nuggets) given. They did not do the step of aggregating content (gold ingots) like Wikipedia has. The marking as duplicate could and should be tempered by “due diligence” or “age of the last time this was asked”, but how it is implemented is up to them.