I came across an article recently. Google is joining Facebook and Twitter to ban all crypto related ads. Why does everyone seem to want to frustrate crytocurrency?
I dont know what are their own reasons why they ban bitcoin and other crypto currency ads in facebook and other social media. Maybe there are only specific countries that do these because they dont support the idea or they are against bitcoin.
It is maybe because those people who got scammed by some fake ICOs reported it to those site who was mentioned by the OP. And I think these sites just wanted to protect their reputations because they don't want to be the reason why people are being victim by a scam. There are still possible reasons why they wanted to bann ICO and this is the reason why crypto continue to decline its value.