I'm in the UK.  Buying crypto isn't banned, however trading is.  I think what's happening is banks are seeing transactions on someone's account e.g. transfer to Coinbase, and whether it's an automatic (e.g. picked up by software) or human interaction, the account might then be blocked as the bank assumes the account holder is trading crypto.  I've also heard of people hitting difficulties when trying to arrange a mortgage/re-mortgage if transactions such as Coinbase are showing up on statements.  There are ways around the latter e.g. just don't move money for a few months prior to arranging the mortgage (banks only ask for 1-3 months previous statements) however I reckon the only way to avoid my raising suspicion with my bank is to transfer money to a third party and then buy my crypto from that source.