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.
The company said (GOOGLE) the ban also applied to content related to cryptocurrencies including but not limited to initial coin offerings, cryptocurrency exchanges, cryptocurrency wallets and cryptocurrency trading advice. : WHICH EVER WAY YOU LOOK AT IT IT IS NOT GOOD