[kelnos]

From what I'm reading many newer devices require a locked bootloader, else SafetyNet will fail. So realistically I think that means only Pixel phones could work, since they support relocking the bootloader with a non-stock ROM.

[floatboth]

Lots of phones support relocking to a user provided key (OnePlus does for sure) but it's a less trusted state than locked to the vendor key, I don't think it counts as good enough for full SafetyNet

[colordrops]

Fishy.