Sorry to hear. This is part of Facebook's illegal ban on cryptocurrency industry ads dating back to Jan 2018. Numerous Crypto influencers have been deplatformed before. Eg: the mass deplatforming over Christmas 2019.
https://www.ibtimes.com/youtube-bans-crypto-videos-again-whats-problem-time-2907086
@jpbliberty's class action lawsuit against this is well advanced in preparation and near filing. You should check it out and join up (its no win no fee).
Legality is irrelevant. This is blatant hostility, and it shows whatbtjeybthink of freedom. We are building alternatives to the corporate world and government money alike. Opposition isn't a surprise.