A friend of a friend was apparently called up by HSBC and queried as to why he was buying crypto. Criticisms of crypto mining aside, it is a legal transaction and as such none of the bank's business beyond confirming it was actually him doing so.
HSBC are really big now on, as they would see it, providing powerful security measures to prevent theft or fraud, but what effectively boils down to being stopped from free use of your own money. Having to call their call centre when you discover they've arbitrarily blocked a payment is like being a kid again and having to ask your mum if you can have some sweeties.
They also have a thing on their app where they ask you what the purpose of a transaction to a new payee is - with a list of options such as 'sending money to family or friends', 'paying a bill', 'buying goods or services' etc. - before they let it go through, then, regardless of what option you choose, a big screen flashes up to say "Warning! This may be a scam". It seems to be designed to make you think that their sophisticated algorithms have identified it as such, based on your answer, but it's basically just a 'no poo, Poirot' thing to protect themselves.
It's interesting, though, to think that the bank is making a value judgment on a legal purchase that somebody wants to make using their own money. I have no personal interest in (or knowledge of) Crypto myself, but I agree that, before too long, we could well see nannying or pure refusal to allow adults to buy perfectly legitimate things that the bank or government frown on.
Imagine if systems developed and joined up to the point where, once it's identified that you buy 15 bottles of wine each week, a message is sent to your GP to inform them that you could be at risk, who may then inform Social Services. Maybe word also gets out to your car insurer and even employer, possibly even put on a police potential anti-social-behaviour watch list. All this because you host dinner parties for 30 friends every Friday night, but apparently can't be trusted to behave like a responsible adult. People will read this and say I'm being ridiculous, but it's all very possible indeed already, should the political will to do it arise.