A half decent flat in London costs in excess of 2000£ per month. Where “decent” means you don’t deal with pests, walls are not made of paper and your neighbour going to the toilet doesn’t cause the whole building to shake.
Universal healthcare varies a lot in Europe, for instance in the UK it is rather limited compared to continental Europe, even compared to Southern Europe. In the UK you would need a health insurance costing ~200-300£pm to enjoy the same quality of care of places like Italy or Germany.
On the other hand a good developer in the US may earn enough to retire in 5 years, 500K$ per annum are not totally unheard of. In Europe if you are very very good, you may get slightly above 100K£, but it’s still extremely rare and you will end up paying half of that in taxes.
