They don't sell you your OS, that's the big surface area that companies like Dell, HP, Lenovo, etc have to swallow.

They also don't make these computers and are at the whim of their ODM, so unless you opt for Coreboot/Libreboot, there wouldn't be a possibility for that.

https://doc.coreboot.org/mainboard/starlabs/starfighter_mtl.... The previous version is already upstreamed, apparently.