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!
This is still unconfimed from twitter,i have been using these hastags sine then and i dont even have blocks from twitter,which exclude me from spamming,these people might be violating twitter terms and conditions that is why they were permanently disabled by twitter either way we should follow these guidelines not to put those hashtags because it might be the reason why we are going to get disabled.