[delinka]

The copyright owner can indeed license their work anyway they see fit. But often, the purpose of OSS seems to be "to share good software with the world." If that's the case, and then they change their license to a "... and you must also share _your_ work with the world," then they can't really complain when A) users stay on old versions licensed with the old license, and B) when use of their systems drops off lots.

I don't see that as the case here necessarily. TFA just points out to potential users that the license has changed and might necessitate dropping MongoDB from your stack.