I use most platforms from time to time, in order to keep up with them, but obviously Google etc. are heavily into censorship, so I avoid them in general where possible. The main thing keeping me using Youtube is that it is so huge, but it's very clear to me just from looking at my subscription list that most of the content I value is no longer on there. I used to watch a variety of topics when I viewed the subs page, but now I struggle to find anything to watch and it is mostly only music nowadays!
I have put a lot of time and effort into literally building alternatives to these networks, but the reality is that without a solid team and the associated resources needed to keep a team happy, such efforts are limited in their ability to expand and be sustained. I look forward to seeing how the SPK network tackles the issues at hand!