As far as I know, browsers will only do Widevine L3. Meaning you won’t get resolutions past 720p or maybe 1080p (depending on service). That’s probably fine a small screen like the deck. Less fine for a 4k TV.

One question I have about the cube is will it be capable of doing full DRM streaming services like Netflix? Most living room systems have that, but doing it on an open linux system somehow would be novel.

Noto (Google) I thought was the most well-known.