I'm from the UK and bitcoin is completely legal.
Businesses that accept bitcoin wouldn't be aloud if that were the case.
We have multiple businesses that even give you bitcoin in exchange for selling your stuff to them.
If bitcoin was illegal in the US why do they have Bitcoin Banks?
You know why they dont accept UK's player deposit, it is not about bitcoin being illegal both in US and UK but rather that if you simply have an unlicensed gambling sites then you cant provide your site to US or UK citizen as you are bound to their rules and your site could be seized anytime they want, as simple as that