Quoting: kuhpunktI saw one comment... it could be a great way to bring a lot of streaming apps like Netflix to the Steam Machine as well. People might want that.

There is a script called SteamOS-Waydroid-Installer by ryanrudolfoba on github which works great with the netflix android app. I have downloaded and watched many netflix shows on the go on my Steam Deck this way. Netflix only allows high-quality content on selected whitelisted devices however, and limits all other devices to 480p. It is not up to valve to properly enable streaming apps, but to the companies behind those apps. Until then, the best option is probably to just use streaming services in a browser.