dubyakay
I’m Canadian now but kept my Hungarian SIM, still paying it to this day after seven years. It’s 9EUR/mo for some paltry amount of data, but mostly just using it for online services that require a Hungarian or European phone number for MFA. I just bought extra data that counted as EU wide roaming data when I last visited.
However the options for my wife were very limited as a non-EU traveller. I think it was €30 or something for ~5GB of data usable in Hungary only and limited to ten days (we stayed for 14) and added as an eSIM with the help of an app/website. It was not transferable to other EU member states, and this was one of the best deals we could find that did not require us to go to a physical store location. This included us checking offers for prepaid SIMs from the major providers (Vodafone / -Mobil / Yettel)
If this happened due to suddenly everyone being able to read each others thoughts unfiltered and without the ability to block others out from your own, it would be amazing. However power corrupts and I don’t think there is an utopian situation where abuse would not happen in a society where information is given up voluntarily.