I would stay away from YAML (almost at all costs).

Here is the link to the original website (an NGO that monitors blocked websites in Turkey): https://ifade.org.tr/engelliweb/distrowatch-erisime-engelledi/

And here is the Google translation of the text on that page:

The IP address of the DistroWatch platform, which provides news, reviews, rankings and general information about Linux distributions, was blocked by the National Cyber ​​Incident Response Center (USOM) on the grounds of “IP hosting/spreading malware”.

I think you are highlighting an important point that are missed by other commenters emphasizing the developer. I prefer GPL over MIT license. But this is a possible fallback if Redis decides to change its licensing (like several others did).

I think these kind of products have strategic significance for MS for their Azure offering. They are probably preparing to offer this there (in addition to and as an alternative to Redis). So, it makes sense for Microsoft to release this with an OSS license (otherwise no one will adopt it).

Who is this particular developer

As far as I understand from the discussions about the topic, Maxim Dounin was one of the few core developers of nginx. Looks like Wikipedia has already been updated.