London Underground banned it, the banks will hate it, what do you think?
transferwise.com
transferwise.com
Then, bitcoin appeared, thanks to which you can send money to many countries for free (or even with a small gain on exchange rate, if youre lucky).
Why would TfL specifically get involved? It's more likely this is an issue for the ASA, on account of it appearing to use the word ‘FUCK’, which is hardly controversial.
http://en.wikipedia.org/wiki/Levenshtein_distance
It shouldn't be hard to argue and force them to disclose what string metric they are using and what distance is the minimum if you're prepared to take them to court.