My guess is better weather, food, and cheaper.
I grew up in south west France. A lot of properties or village even would have disappeared without rich Londoner. I don’t resend them a bit. Even the more obtuse one.
Britain: https://www.manchestereveningnews.co.uk/in-your-area/new-mcd...
Spain: https://fineartamerica.com/featured/mcdonalds-madrid-spain-p...