As part of the relaunch of Microsoft's streaming platform, many current members got a free channel subscription to use.
It applies to folks who were at level 10 and above on Beam prior to the rebrand, which didn't take a lot of getting to and will have covered off a fair chunk of the members.
Subscriptions are how you can help support your favorite content creators, by throwing a little money their way. It only applies to Beam Partners, but the list of those is growing by the day, and you'll get some kind of perks thrown in for good measure.
Full story from the WindowsCentral blog...