I wish Stumble Upon still existed just so I could find the weird corners of the web again. This site and Reddit sort of fill that but also don't quite fit it at all.
I guess it's what the people running it want but I find myself going there less and less every day and only look at a few curated subs
It's my observation that the average redditor is more interested in gaining upvotes via silly class-clown behavior, than actually contributing meaningful conversation. Or interested in upvoting silly comments.
Even in subreddits where the topic of discussion is something serious, such as a forum for advice seeking, people can't help but reply to posts with jokes.
What is worse is when people are downvoted for a reply which is intelligent and serious, but is contrary to popular opinion.
To be honest, I don't know why a similar app or extension hasn't come up to replace what Stumble did. Surely there's advertising potential there (1 ad per every X clicks) and even a subscription option (remove ads or access to unlimited interest categories for $x dollars).
And there's both a reason for that being the case(nobody wants spam, and moderating can curate effectively in the best subs) and for it being harmful(community interaction ossifies into a familiar set of things that get upvotes, which subsequently pollutes every thread).
I don't really think it's that the niche stuff has moved away from the web - it's that nearly every functional discovery mechanism (that my now 30ish year old self knows about) has been captured by advertising or killed.
When all you ever get served up is links to the same drivel promoted by folks who have no honest interest or curiosity, but are essentially mercenary marketing/sales (sorry - influencers blegh...), then the web starts to feel like a bland wasteland.
Some of this is entirely related to being older - but I do genuinely think the current tech powerhouses on the web are trying their damn hardest to kill off any & all organic discovery mechanisms they can. Often through completely disingenuous means. If that fails, they buy them and shutter them, or roll them into the brand where it becomes the same drivel again.
However true or untrue all of the political intrigue, journalistic threats, etc., it's just crazy to me that such an innocent corner of the web that I loved so much in the mid-late 2000s was sending death threats to journos in London not 8 years later.