I’m not particularly militant about Linux distros, but Alpine is one distro I disapprove of in particular. The reason is that it isn’t GNU/Linux – it strips out (copyleft) GNU libc and coreutils and replaces them with permissively-licensed alternatives. I think that (whether intentional or not) it caters too much to corporate interests that exploit “open source” without truly respecting the users’ freedom, and therefore its popularity is potentially harmful to the Free Software movement in the long run.