As an inhabitant from Belgium: self-service gas is permitted. In fact, I can't think of any gas station where you don't self-service. I wouldn't trust that article too much.

E.g. here is a random photo of a gas station. No room for an attendant:

https://www.google.be/maps/place/Esso+Express/@51.0211239,3....

Good to know! The only country I can confirm on that list having attendants is Thailand.

In Brazil, self-service gas stations have been illegal since 2000 [1]. I remember that in the 90s some gas stations tried to implement this model, and I think it didn’t gain traction because of a mix of unions being against it and the general public just not liking it.

[1]: https://www.planalto.gov.br/ccivil_03/leis/l9956.htm

China also.

I'm not sure about not permitting, but I remember getting gas for a rental car in Paris, from one of these sidewalk places (looks nothing like a gas station; parisians, hopefully you know what I mean), and I sure was happy when the attendant came out to pump it for me. I wouldn't have known what to do at all.