At point is it legitimate for a certain government (state, city, municipal etc) to say a commodity or service (water, utilities etc) should be a right for all of its citizens? And provide the public utility as a monopoly?

Will emerging network states / city states do the same?

creating and destroying; built flying cars & autonomous vehicles, now building roc.camera, writings: july.rocks

Yes, if these rights are enshrined in the law and supported by social welfare policies, in my opinion it is legitimate for a government to provide essential commodities or services as a public utility, especially in a stable country.