Twitter is going to ban off ads ICOs and Crypto but this will not affect to crypto market because i think coins or ICOs which have bad project, need run off Ads. For good project this is not necessary.
of course this will be influential, twitter is one of the media that preach the journey of a crypto currency, especially those still doing ICO, they will update the market price for their coin or tokens. and even that continued after the ICO was completed.