"we’re fighting for the freedom of people who bought smartphones to install apps from sources of their choosing"
This will fail - spectacularly - because the freedom of choice isn't being taken away just because a store imposes guidelines for their store.
This fight for the little guy against the likes of Apple & Google - competitors - would be noteworthy (the lols alone are worth the price of entry) and more plausible if you didn't obfuscate the motives.