I don't think it will shut down crypto youtube channels only the advertising at the beginning. If their content is about crypto they are only giving their option on the matter. So it's freedom of speech. The same as facebook did it was only for paid advertisement.
True. The channel will continue to run, no matter what, cause people can share their views, analysis, predictions and knowledge about particular topic.
Most probably the advertisements that get displayed on youtube with playing a video, etc will get banned as most of the times they promote scam projects and ICOs and attract people to invest money in them. There is difference between banning of channel with crypto content and banning of crypto advertisements.