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 do realize that recently twitter is getting more stringent on the rules and regulations, many of my crypto friends twitter account is being suspended out of no reason, i advise if you want to grow your followers grow with care and not use third party application which will increase the risk of getting suspend.