But ALL EU mobile cards do include it by default. Pay 7.99 prepaid/month at Aldi in Germany and you are set. Pay 15 CHF prepay in Switzerland and you are lost. Pay CHF 99/month in a contract in Switzerland and you are (probably) set.Oh I wouldn't expect it in a prepaid card, but as far as I know all major Dutch providers have included Switzerland. So those EU citizens driving through Switzerland with kids watching YouTube probably all have it included.
As for Switzerland it is purely a provider thing, based on your individual contract - paying for extraterrestrial roaming. Providers do it vice versa.