Nowadays the devkits require a license key to operate, which only works for a limited amount of time, so when they do slip into the wild it's generally not possible to do anything interesting with them. You can find videos of people playing with PS4/PS5 devkits and they just throw an error that the system has expired and needs to be renewed. They're just collectors items now, unfortunately.
That maybe is not the whole story, but I've often assumed that was part of it.