Lot of regulations apply for crypto these days.
some economists say this will be the year of regulation, where more and more regulations will emerge to regulate cryptocurrency.
some countries ban exchanges and also TAX applying for them.
Some countries that prohibit exchange sites because they consider the bad impact that is produced can not be unstoppable again, there are others who use other ways to provide a very high tax that is above 20%.
some countries ban ICOs.
I hope all countries forbid ICOs (ICOs that are synonymous or contain fraudulent elements) as they may harm many people.
one of the major social media facebook stop all crypto ads.
A very wise decision, because as the world's largest social media company, its impact on Cryptocurrency spread is enormous. they do not want to allow fraudulent projects in which cryptocurrency-based uses facebook as a stepping stone.