That is that is because your not thinking like a paranoid tinfoil hat person. Also keep in mind that compromising device like this would not just be about compromising a hardware Bitcoin wallet, it would be about compromising thousands of IoT things that could be anywhere doing anything giving who knows whom access to who knows what.
On contrary, I am thinking like a paranoid tinfoiler most of the time, but I am realistic about this subject.If you think this devices are compromised than you shouldn't use your smartphone, laptop or any other electronic device for anything related with bitcoin....since you are 100% ''paranoid tinfoil hat person''.
But why risk it, which is why I and then you pointed out that anybody getting these should only be buying them from m5stack.com or their approved suppliers.
Better thon risk anything and don't use bitcoin at all, your computer and smartphone are compromised already 