Some of these suggested videos may be fun to watch but Youtube has become really bad over the years to discover interesting, not well-known content. Now they're trying to maximize ad revenue, and the recommended videos have suffered as a consequence, only pushing top-popularity content pushed by "content creation industry" with very little quality.
...so they're not interesting to you. I see several news and music-related videos that I might watch. Like I said, YouTube presents you with a set of videos you may be interested in, and even if you're not, it also gives you tools for finding videos yourself (e.g., through tags & categories). The moment you start watching videos, it starts refining recommendations and funneling you towards more content.
By contrast, PeerTube's homepage is pretty bare. I don't even know what the interface would look like if I did sign up.