It may be the case that people in other regions have different concerns that nevertheless are addressed by the same sort of technology. For instance, other people may want a way around government mandated pornography blockers, local ISPs with their own bad reputations, etc.

Of course if somebody has none of these concerns, the Firefox Private Network is optional and they can decide not to use it.

If you are not in the US then this will not be your default.

And if you are in the US and your ISP is not Comcast, then it's probably Spectrum, ATT, Charter instead. Not highly trustworthy companies either

Then you would still need to figure out what ISP your doctor's office has?