The problem is...
the UK can close the loopholes, but how do you persuade another country to change its laws? Especially one that is making money from it [looks across to UK's next door neighbour]
We're not the only ones facing this problem, Australia hauled up a big company about this in the last year as well - I believe it may have been Google - and found they hadn't broken any law.
Countries either unify to stamp this out, or it all unravels. Well done to the European Parliament for making sure everybody sings from the same hymn sheet. Sterling effort!