You're not looking far ahead enough. Use of these alternatives will be banned.
I already cannot use any of these alternatives: all cell phones must be certified to be imported into Brazil, and so far I could find none of these alternatives certified by ANATEL. My only options are Android, Apple, or non-smartphone "feature phones" (they still exist). Yes, Brazil is one of the first countries on the list for this change from Google, and Apple already does something similar.