As of this month, the CBS All Access streaming-video platform—home of popular shows including The Late Show with Stephen Colbert and now Star Trek: Picard—stopped working on Linux PCs, regardless of the choice of browser. Ten years ago, this would have been just another day in the life of a Linux user, but it's a little surprising in 2020. We were originally tipped off to the issue by a few irate readers but quickly found it echoed in multiple threads on Reddit, Stack Exchange, and anywhere else you'd expect to find Linux users congregating.
I'm both a Linux user and a CBS All Access subscriber myself, but I had been unaware of the problem since I do all my own watching on a Roku. Technically, the Roku is a Linux PC in its own right—but CBS has its own app in the Roku store, which works perfectly.
Moving back to one of my own PCs, I was quickly able to confirm the issue: trailers autoplay properly, and even the ads work—but the actual content won't play on a Linux desktop PC on any browser including Google Chrome. Diving into the Chrome Web Console, we can see HTTP 400 (Bad Request) errors when the browser attempts to fetch a license from CBS' Widevine back end.
Historically, some sites and services have deliberately blocked Linux User-Agent strings from accessing them, under the mistaken belief that doing so would reduce their support load when the service itself actually worked fine. This does not appear to be the case with the CBS All Access issue—changing User-Agent in either Chrome or Firefox doesn't have any effect on the string of errors when attempting to play content.