Alpine isn't a distro one would upgrade. It is usually used for throwaway containers, so the upgrade path is clear: throw the old one away, create a new one.
I have Alpine installed on many physical and virtual machines all around the USA. I know I am not alone on this. Some VPS providers also offer it as an installation option and some VM's are long-lived.
I run Alpine as the OS on my home router. It's probably the most comprehensible distribution, I feel like it's actually possible for a mere mortal to understand the system. There are dozens of us!
Make that three :). Alpine is my "daily driver" on my laptop. I have several very long lived cloud VMs running it too. I know it has the reputation as "just" a container OS, but it's a pretty regular Linux distro. I think it's a joy to use on a daily basis! (I also believe it can't be that uncommon to daily drive it.)
