I do think there's a niche hole in the market for a cloud host that's as easy to use as the major app stores. Fiddling with hardware and network routing is way too technical.

This is basically what HOOBS markets. They've really fallen to the movement of open source though.

I think there's still a world in which you can buy an rPi with software preinstalled and updaters packaged without much effort though.

If that could take off, you could easily have this type of service. However, I think it falls apart because you need to govern the app store and that is expensive and difficult.

Synology NASes are a popular choice.

There's Umbrel which sells a device like that, or YunoHost + your own device

Umbrel is just plug-and-play with an app store, haven't personally tried it but looks very cool.

They tried this with a device called Helm Personal Server. No, not the Kubernetes manager.