I don't think doom and gloom made reddit less interesting. I think it is the opposite that some power users feel appointed to clean up anything they do not like or classify as misinformation. Although these "hot to get rich" posts certainly are nothing but.

TikTok is certainly not solving the Eternal September problem, it is accelerating it if it doesn't keep some groups separated at least. There is really good content, but there has been on Twitter and reddit too at first.

But only light-hearted content and artificial positivity can also be worse than doom and gloom in some cases. Political incorrect jokes are sometimes enjoyable. Not everything needs to be a message with the latest hot takes in pedagogy that don't even make too much sense.

I think healthy communities still don't take internet comments too seriously.