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
It's always been a reminder for the rest of people who have twitter accounts to be careful with what they are tweeting especially in the heights of crypto fraud/scam that's been the mainstream lately. To prevent others to get scammed, it's the initiative of this Social Networking Site giant to help protect their users welfare.
The fact is that people in social networks have become increasingly abused by advertising campaigns. Of course, with the help of their accounts, many users can cheat and because of this, the administration will make very tough solutions to problems.