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
Well I would not began to do the bounty the social network , due to the fact that the payouts are very kopeeshnaya , and of course I did not get banned even for something that I do a bounty there if you take the spam then Yes you will block and so is unlikely