Sources:
https://www.coindesk.com/social-media-giant-snap-confirms-its-banned-ico-ads/
https://cheddar.com/videos/snapchat-bans-cryptocurrency-ico-ads/
If anyone is really interested in the growth of bitcoin, then you would care and be bothered about the bans here and there because its sending only one message which is heard loud and clear all over the world and that is crypto currency cannot be trusted. To someone already aware of crypto currency, you can separate the trustworthy ICOs from the others, you can separate bitcoin and other reputable coins from the rest but to a new individual its one and the same.
Again, its not about whether someone is using Snapchat or Instagram but what mattered is getting the message out and this platforms have been a useful means that spread beyond geographical locations, since its likely impossible to advertise on TVs. Aside that a lot of people have come in contact with crypto currency because of advert of an ICO which he didn't eventually participate. But now, all of those means are being shut, then we are likely to get stuck at a point of even go down further.