Tons of them... Years ago the first crypto crash was caused by US regulations that prevented the use of crypto in ordinary transactions (so you cant use it in stores int he US)... more recently regulations have made it illegal for my bank, one of the biggest legitimate actors in the crypto world, to stop supporting crypto. To quote a representative from the bank: 

"As a result of the evolving regulatory environment and the uncertainties around the crypto market in the U.S., we’ve taken the difficult decision, together with our U.S. banking partner, to suspend access to cryptocurrencies through Revolut in the U.S."

Sadly the USA has went out of its way to regulate crypto out of existance and create exactly this environment, where it is virtually illegal to hold or use crypto so that only those who dont care about what is legal is left using it. This has been a very clear and obvious pattern out of the US government in an attempt to kill crypto. 

 @b05df304 The only thing keeping the USA in its privileged position in the world, is the worldwide use of the dollar, and the threat of the USA military going after anyone who tries to supersede the dollar.

Lately the USA has been abusing the hell out of that position. Eventually China and Russia and the Middle East need to create a crypto backed by oil - as in present the currency at one of their oil ports and they fill up your ship - and then what will the USA do?