You are just a consumer on Android. The founders call Google 'the third half of your brain', and when you use Android you realise you don't control that third half, it's controlled for advertising purposes (with access granted or taken for various government agencies). Ubuntu, Jolla or Firefox need to succeed on mobile because Android is actually worse than Windows 95, XP etc for user customisation and freedom. That's stock on a Nexus too, the custom versions from handset manufacturers are a whole different train wreck.