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Alpine is also arguably not “GNU/Linux”, as it doesn’t use GNU Core Utils or glibc. But I don’t know anyone who would suggest that Alpine isn’t “proper Linux”.
Alpine or PostmarketOS works for older stuff. Some others will run Ubuntu as well.
Instead of “Linux on [phone]” try using Debian/Ubuntu or one of the mobile-targeting distros as a keyword
Alpine is also arguably not “GNU/Linux”, as it doesn’t use GNU Core Utils or glibc. But I don’t know anyone who would suggest that Alpine isn’t “proper Linux”.