You're already thinking about it more deeply than I am! The tax issue - I was really just thinking about if from your own perspective -

I'm sure what you're planning means you're personally liable for all tax on any gains made even from other people's money.

It'd be better for you if you were in Portugal where there's zero tax on crypto compared to the UK, where it's taxed in a couple of different was potentially.

Of course if you think you can remain anonymous, that's a headache removed.