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
Again? Last time that is a problem to the social media accounts also in Facebook and now it is back again. Because social media campaign makes the account spam that's why Twitter and Facebook starts banning cryptocurrency spam. So be careful.
The Twitter campaign now is not that profitable unlike before since there are too many participants and too many ICO, it abuses our twitter profile in a way to still be careful about choosing which campaign worth joining.