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 agree. Since Twitter has followed suit with what Facebook did a few months ago. I think that it would affect those users, most especially those that have used their long time or original accounts. That's why not very many people want to do social media campaigns because it may jeopardize their accounts, since normally, people don't want to be flooded with information that for them is fairly useless. Also, since there are many bad ideas regarding cryptocurrencies, it's not too far off for other people to not understand why you are posting such content.