I think this will be good for the crypto community in the long run. Too many scams are going on and its too easy for people to be scammed by these ads. The ban will force projects to actually talk about the merits of their actual technology, not just ICO, ICO, ICO. In the past it was just too easy for any crap company to push ads and get people to invest.

Sounds like FB and Google and Twitter will still accept ads promoting blockchain projects, just not purely pushing crypto.