Well, I assure you most London bankers won't lose any sleep given that the money is often from Gulf states/places like China/ex Soviet oligarchies/various forms of corruption in the global south. The countries where the money flow out from often lack the means to actually pursue and prosecute overseas, especially for what boils down to "white collar" offences/corruption. It's only when anything like terrorism/organized crime/anything involving Uncle Sam's tax revenue occurs then the banks AML processes might become useful for more than just check-the-box compliance.

You will often find that entrepreneurs and digital nomads get caught in this sort of of AML debanking web because the paltry 6-7 figs of business/personal transactions across countries often resemble mules/illegitimate businesses and the banks are not allowed to talk about it. (Just go to the subreddit for wise or PayPal and search for the keyword "frozen")

Meanwhile international students can easily bring in 8 figs to buy houses and that's perfectly fine because it's "clean" as far as the compliance department is concerned. It's also a cultural issue, fintech platforms and neobanks try very hard to use heuristics to automate compliance. This is why I recommend digital nomads to use a proper cross border bank like HSBC Premier. You pay a lot more but you get a lot less of the "account frozen" bullshit.

You should also take a look at this

https://news.ycombinator.com/item?id=43001441

Countries that are caught in between corruption and terrorist threats and Uncle Sam are the worst generally. E.g. transfering money both into and from Turkey are a pain in the ass.