I agree. Big centralized platforms (youtube, Reddit, the chans, HN to some exent) mean that the internet riff raff (i.e. people with no interest in the niche and who may feel like trolling) are free to show up in any given niche area of the platform (e.g. a subreddit or someone's channel) and then shit all over it. A community that would have been perfectly peaceful on a newsgroup, IRC channel or forum now has to contend with literally anyone from anywhere else on the platform. The old 4chan quip about /b/ leaking is now the default state on basically every platform because the platforms are so big even a small trickle of trolls is a full on flood of crap. People are getting fed up. I think there will be some decentralization in our future.