This doesn't work for businesses that need to profit from what they do. Keeping things proprietary, while benefiting from source-available software is impossible if a company has to release their source. Competition goes out the window.
So while RMS has a nice ideal, it doesn't generally apply.
That's a tragedy of the commons, not something any company is entitled to (BSD-style licenses excepted). Enjoying the benefits of an ecosystem while not contributing to it is not a thing to laud.
> So while RMS has a nice ideal, it doesn't generally apply.
...and here we are, with a MongoDB pulling a bait-and-switch on licensing because they want to have their cake and eat it. You shouldn't expect to only get the kudos (and higher adoption rate) that result from your open-source license and not run the risk of someone (possibly a competitor) forking your code. That is the price of admission into the open-source world.
It might not work with certain business models, but that's alright, others would fill their place.