Several decades back, when Intel was the main force in the CPU markets and AMD had yet to begin to hit its stride, Intel began clock-locking its CPUs. The reason was widespread bootlegging in China and elsewhere, where the bootleggers would take low-cost Intel CPUs, silkscreening them to deceptively show that they were more costly Intel CPUs when the fact was that the low-end CPUs were being overclocked and overvolted by the resellers. In reaction, Intel put out software to detect the fake CPUs and began locking CPU clocks and selling tiers with expense predicated on MHz.
I remember it so well, and it seems so comical to me now, because I was teed off at Intel for doing this because I liked to overclock my x86 CPUs & Celerons 100%, like you could easily do with those CPUs back then (16MHz & 32MHz, etc) and I saw it as a cash-grab from Intel. How dare Intel mess up my OC'ing party? The nerve! People were supposed to be able to massively overclock their CPUs effortlessly, and so on. But since then, the magnitude of the CPU bootlegging problems have grown exponentially, along with the general CPU markets. I am somewhat surprised to see it still going on today! Selling dud CPUs is even worse.