Sony sold the PS3 at a pretty significant loss and had an "OtherOS" feature that allowed people to install Linux on it.
Between that and ots cell architecture, it turned out to be a super affordable way to build supercomputers. Sony eventually disabled the OtherOS feature to combat people buying them en masse and costing Sony their lunch, and they got a LOT of flack for it.
Valve is doing the opposite. They're keeping the openness, but charging enough money it's not financially viable to buy a bunch of Steam Machines to build cheap AI clusters.