That serious conversation area has crossed my mind many times too! Or a crowd-sourced extension to highlight engaging comments.
On reddit in particular I was exhausted to go into the comments only to scroll past heaps of accounts making the same tired jokes and low effort jabs they’ve seen around the topic before. Anything to skip the millionth ‘falling out of the window’ or ‘getting shot in the back of the head twice’ joke.
That was very likely Street Complete which is self explanatory and a great way to start. You are adding all kinds of useful information about any kind of object or building with this.
There’s also Vespucci which allows to alter the whole map (ie edit streets, POIs and so on) but takes a lot more to get familiar with.