Gabe Newell has been openly critizicing Microsoft for quite some time now and therefore, Valve has been pro Linux for years.
It is not too far fetched that the Steamdeck is their second attempt to make Linux gaming more widespread after the failed "Steamboxes". This and they took the opportunity to make a PC-Switch knock-off when the market was perfectly ready for it.
Gabe Newell has been openly critizicing Microsoft for quite some time now and therefore, Valve has been pro Linux for years.
It is not too far fetched that the Steamdeck is their second attempt to make Linux gaming more widespread after the failed "Steamboxes". This and they took the opportunity to make a PC-Switch knock-off when the market was perfectly ready for it.