IIRC, I had a PC (since sold) that had secure boot permanently enabled from the factory. That is, in spirit, a PC with a "locked bootloader", but you might not even notice because many Linux distros have that Microsoft-blessed Linux loading shim... but it is still Microsoft inserting themselves between you and your hardware; they could decide in the next few years they no longer "support" Linux, hypothetically.
It makes you wonder if they have a whole bunch of training data in this style, or if it is the mathematical average of all cartoon styles mashed together.
I would say simply to avoid buying phones from ad-companies, but more generally... if you buy hardware from vendors that respect ownership (i.e. that have user-unlockable bootloaders) then you don't really have to worry about this kind of thing, as even if the company turns evil later, you can probably flash the phone with a 3rd party rom.
That would be the brute force approach.