I wouldn't choose mongo for many reasons, but this licensing change isn't one of them. It's in line with the general spirit of the GPL: if you're going to stand on the shoulders of giants, you should allow others to stand on your shoulders.
The only major change to the license is in adapting to the rise of cloud services.
The GPL is only a copyright license. The GPL DOES NOT impose restrictions on usage, where "usage" vs "distribution" gets defined by copyright law itself.
That's one of GPL's biggest strengths.
Also successful software packages that are GPL are GPL for everyone. You don't have a mother company that can bypass the GPL due to them owning the copyright. And when you do it's usually a scam that people can smell.
You can't say about a license change that it is in the "spirit of GPL" when the mother company, MongoDB Inc, doesn't have to play by the same rules as everyone else.
So I'm sorry, but when you're talking about the "spirit of GPL", you don't know what you're talking about.
The only major change to the license is in adapting to the rise of cloud services.