OKAY, I knew someone was going to call it out. Yes, Steam Link failed. I loved it, we all loved it, but commercially it was a flop. They thought everyone who had a steam account would jump at the opportunity to stream their games, and many of us did, but it wasn't as huge of a deal as they thought, and it's why they stopped making them.
However the technology was good, and paved way for modern steam streaming and with the controller gave us the Deck today. They pushed forward. The Link though, was a commercial flop.
As other comments have said, they aren't even doing game streaming, just mobile games. You can already download mobile games through heir app on a phone with a subscription.
And Steam didn't really fail, it excels at streaming games around a network. Xbox games can all be streamed with game pass and its pretty good.