I have for a while now thought that the ethical source licenses are at least trying to do exactly what open source licenses are trying to do, just within a human rights framework.

The SSPL and other source available licenses on the other hand basically just take away the ability to make a meaningful fork, making the project proprietary. Sure it makes business sense, but someone might still feel the need to make an FOSS alternative.

That doesn't make sense as far as I can tell. You would need to release the source code of the managed service you built around MongoDB.

In SSPL you need to release sources for all software you use to build your service.