If Twitter prohibits cryptocurrency advertising, I don't think it will have a major impact on the continuity of cryptocurrency, but instead I see that it will be detrimental to Twitter. restrictions on the use of cryptocurrency advertisements will be made by Twitter to prevent misuse of cryptocurrency.
Twitter has already prohibited cryptocurrency advertisements. Does it make detriment to Twitter? Nope it doesn't, Twitter don't need crypto projects, but cryptos projects need Twitter. If you could at least read the topic because it's a quite old news now, you would have been aware of the ban from Twitter already here
This prohibition will certainly make the movement or progress of crypto to be less good, because the Crypto is newborn and they still need a good promotion such as via Facebook and Twitter. So if they banned the crypto ads of course this will make impeded crytpo.