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Bitchute is gaining users because it looks and acts like YouTube... nothing new to learn.
LBRY does things a little differently. There's no corporation involved, for one thing. Everybody retains ownership and control of their content. It's not as easy to switch to, but it's worth it.
I've been shadowbanned on Bitchute since I started there. I have 100+ documentaries and videos there, but only 30 subscribers, including all the subscribers who followed me from YouTube (9000) and other platforms. 30, after months of daily uploads? My stuff isn't THAT bad! : P
(For comparison, on LBRY I have 500 subscribers in the same amount of time.)