The banned is due to the fact there are so many companies who are advertising ICOs that are not currently operating in good standards and faith.
In the meantime, Facebook is encouraging people to report content that violates this new policy.
What effect do you think this will have on ICOs and future of cryptocurrencies?
The crypto community is strong enough these days and can resist it. It doesn't matter Google, Facebook or anyone else has decided to ban ads related to crypto. The other projects used this opportunity to promote their products. Pay attention to such products as desearch.com or matchico.com They are related to crypto. Besides, there exists a lot more.
This was done to clean up the space anyway, so I do not see it as something bad or an attack on the crypto world except for some who just love reading negative meanings to everything.