I've purchased two devices (well, two each elf or the wife and my self). I 'justified' by saying I was going to look at the protocols they use. One of the devices uses cert pinning but I didn't get more time to look at it (switched jobs, so I've been busy). Both vendors are very,very upfront about how much data they collect. I just looked and I haven't put them on this phone yet. But they are most certainly not hiding that they collect data. That would be like thinking Chaterbate wasn't watching who you tip, how much you tip and what your kinks are.