Just because someone was born in Russia does not make them a specific type of person. Nobody chooses where or when they are born. 7-Zip has been for ages, and if something were to happen to it then im sure one of the dozen of forks around will take the role as the “main one”. However you are right, companies desire something predictable, stable. Which is why some companies like SUSE, Red Hat, etc. Manage to sell FOSS. in fact i believe some of these distros include p7zip, and they freeze it to a specific version, security updates and bug fixes are backported.

I am sorry but this list is… not-good. Includes problematic ROMs (Copperhead OS), dead projects (AOKP), and OEM closed-source ROMs (MIUI)

To anyone out there, my personal recommendation would be: if you own a Google Pixel, go for GrapheneOS or CalyxOS, if you do not have a Pixel phone, try LineageOS and derivates (I am personally running crDroid with microG instead of gapps)