@evochkauwu >This is not very profitable
Is all you think about the profit of billion dollar companies?

If you actually meant that such is not very cheap, obviously freedom isn't cheap.

Old thinkpads are cheaper, same as a specific model of macbook but those have some drawbacks.

Supported hardware is listed here; https://www.gnu.org/software/gnuboot/web/docs/hardware/

>it will be cheaper to take old Xeons from Aliexpress and a Chinese board or build a PC on old AMD Ryzen
Yes, for the reason being that such hardware won't init without proprietary malware, with digital handcuffs to cryptographically prevent its replacement.

Even if you're ultra-stingy, why would you go out of your way to get hardware that doesn't respect your freedom?