Now there are massive blocking of Twitter accounts.
Most often, block accounts when you to use mass-following. Blocks is forever!
Also do not use hashtags #ICO #Cryptocurrency etc
Be careful!
UPD
Some accounts of my friends that have been blocked marked "forever" are now unlocked
But anyway, I think we need to be careful
I think we should also be careful not only in twitter but other social media also, seems like they are banning things about cryptocurrencies nowadays. I think there are still some ways not be blocked in twitter.