Just factory reset the device, as if you had bought it used (if there's no way to do this then the laptop has much, much bigger problems). Buy a new laptop, do

Just factory reset the device, as if you had bought it used (if there's no way to do this then the laptop has much, much bigger problems). Buy a new laptop, do this to it, return it the next day for a refund. Rinse, repeat. This attack is what locked bootloaders on cellphones are supposed to prevent. I don't support bootloader-locking, but it's confusing that Apple is bringing locked-bootloader smartphone-style security to their laptops+desktops and then opening up a gaping hole that they worked so hard to close on the iPhone. Seems incoherent.