Not saying they have backdoors. But it's not impossible to backdoor if they want to.
Big Hyperscalers don't buy individual PCIe cards. They buy pre-built servers with GPUs. In that case backdooring is extremely easy. For example all the existing AMD and Intel processors already have a hidden computer, which is effectively a backdoor. It's a complete subsystem with a CPU core, it's own RAM and it's own operating system (Minix in the case of Intel). They operate at a ring beyond the reach of the host OS kernel, has the ability to read all the data that goes through the CPU, has the ability to reach internet and phone home without the knowledge of the host OS.
Even in the case of discrete cards it's not impossible to do nefarious things. It connects to a PCIe port so it could in theory emulate almost any kind of peripheral including input devices and network interfaces.
While the idea of a "backdoor" is plausible, the idea is a bit far fetched because phone home attempts would be pretty easily detected by firewalls that these servers typically run behind. And frankly, any big hyperscaler with a budget to buy these servers should have a competent enough IT department to not put these servers on a network with access to the open internet.
can we please refrain from straw man and false equivalence type arguments?This is like 90's 1337 shit.
Also, pagers shouldn't explode, right?

