Check and try to understand what the guy tried to say:
https://techcrunch.com/2018/01/30/facebook-is-banning-cryptocurrency-and-ico-ads/
He's not against crypto, but the companies that they think, might be conducting some illegal practices or may not be in the interests of their users.
If you would have been at his place, you may have taken the same decision to save your users from having losses whether it be related to finance or data.
Many people over Facebook and any other social media are totally unknown of the cryptocurrencies and their nature and under the effect of greed, these people invest and lose sometimes and start blaming these mediums only. Such people are lazy enough to even bother to learn more about these things and plunge into crypto after which they are left with just one thing - and that's regret over their decisions. I urge these people to please do a thorough research before getting into this - you should really know what you are getting into.