H & M's Security costs

So Canadian taxpayers will not be footing the bill for security while H&M are living in Canada. Can't say I blame them, neither do I think that British taxpayers should pay while they are living in another country. What do you think?

Will the US pay when they move there?
If they are stopping Royal duties shouldn't they cover the bill themselves like other celebrities have to do?
All that we are is what we have thought.