Olvid, a French alternative to WhatsApp, was made in 2019. It took a law passing last month banning all ministers from using non in-house messaging services to stop people from using WhatsApp. I wouldn’t consider that “trivially easy”.

Except in your own example, a viable alternative was immediately available. Users didn't switch because they didn't have other options or were physically limited from using anything else. They just preferred to use WhatsApp. Switching to an alternative was trivially easy. People just didn't want to because of personal preference. It would be trivially easy for me to stop drinking coffee every morning and only drink water - there's nobody pointing a gun at my head to make me drink coffee - but I like coffee and would be annoyed by giving it up and probably have a hard time quitting. The same is probably true for many people. Should access to coffee be considered a utility? Probably not.

I already said this is a “government problem”. I said this in reference to the US government, because this isn’t really an issue for most countries :/

You mentioned WhatsApp. Several times. WhatsApp is owned by Meta, an American company. If you want it to be a public utility and its owned by an American company, which country is going to be the one to make that happen? Also, calling "completely eradicating the first amendment in order to make it so that the American government can forcibly seize and censor people on its new state run social media websites" a "government problem" is an atomic bomb level of understatement.