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Dtube is great for stuff thatd otherwise be censored, seen as it will definatly stay up short of physical intervention by law enforcement - you need to host it yourself though. I tried that for a while, worked great and longterm no problem. But that requires you are somewhat techsavy and set your own IPFS node up. Otherwise, dlive seems like the best option for videos. And steem connects all plattforms built around steem and you can build plattforms around steem yourself with relative ease. Steem isnt really a plattform but a great meta-tool in that sense. Steemit is one access point to content posted on steem. The great thing about steem, you can use any of the tools and plattforms built around steem and your followers will see your posts.
Gab.ai is being censored now,mandated by the hosting company. Impossible to happen to steem.