MS runs a grant program that awards $10K each month to one open source program. There's a vote each month to decide which project will get it, and you are only eligible to vote if you contributed to a OSS project not affiliated with Microsoft or were a maintainer for an outside OSS project that received contributions from some threshold number of devs within the last 30 days.

Very much a token reward, but I was surprised to learn when I first got notified about having a vote that: A) Microsoft actively tracks my outside activity on GitHub[1], and B) that they encourage it.

[1]: This would have been creepy if I hadn't agreed to it by linking my GitHub account to my corporate identity. I make a lot of contributions to official MS open source projects and didn't want to make a separate work account.

Non-fungible ones