Live Valve/Gaben reaction :

We designed this to be an open platform so that people can take steam os and do whatever they want with it.
After all, once they have the device, they'll be getting the games from us anyway.
We find that it's easier just to give people the tools, and then they can make us money. It worked with steam, TF2 workshop, and it will work with steam os and steam deck competitors. We sell out of whatever we make pretty quick anyway, so I don't care.
I'm going scuba diving now

EDIT 🤔 I wonder why it didn't work for Source/hammer/SFM(except for porn)/etc? Is it because hammer sucks balls?