I get that they're moving away from convergence, but what does this ultimately mean for Ubuntu as a mobile OS? In the grand scheme of things, what does this mean for users who want a completely FOSS stack for their phone (let's ignore the baseband for now)? As far as I can tell, this just means that your only options are Android or iOS. It's not easy to get a Jolla/SailfishOS phone that will work on most Canadian or…
And also ignore locked bootloaders, DRM code in ARM TrustZone, never updated BSP that make most devices use old kernels, userspace blobs for graphics and video playback, lack of proper hardware documentation and fact that most of out-of-tree drivers that are open source are simply horrible.
Google never wanted FOSS stack on your phone in first place. Same true for phone manufacturer's, hardware vendors, carriers, media companies and governments.
So there simple not much you can do other that support rare open hardware efforts and use extremely overpriced custom-built phones.