Maybe there is nothing shady about them at all. They're security maximalists, even more so than Google and Apple, and they're very open about that.

From which follows that, just like Google and Apple, they must protect your device from yourself, and therefore they too won't let you own your device.

For me, it's not shady in any way - it's just the same stuff as the Big Two, just with different branding and different organization behind it.