This is why open source is rapidly becoming obsolete ;) There have been source-available/fair source/whatever-you-name-it approaches before.
They were attacked by OSI zealots every time because it's not real open source. Which is true, but the unsaid - or well, only sometimes mentioned - other half is that these open source enthusiasts would you rather have a bog standard all-rights-reserved commercial licence than a relatively open licence without the four freedoms!
I can't claim to read other people's thoughts, but my hunch is that this happens because it's too "close" to an open source licence so they view it as competition, while they view commercial software as either a straightforward enemy or they don't care about it whatsoever.
The history aside, this approach just makes the open source community more and more irrelevant each day, especially with the advent of "vibecode your own dependencies up". The 4 freedoms come from a place where they were about users, but gigantic corporations have shoehorned themselves into being users, and instead of the community defending against it, they think the freedom to exploit the maintainers' work while contributing nothing back is more important than keeping the commons free and shared. :P
Only siths think in absolutes.
The freedom to host open-source software is more important than contributing back to the original project: it's where the actual value of open source comes from. Would you host your website behind Apache or Nginx if you couldn't just switch providers and keep the same web server? Would you ever pick up Postgres or MySQL if you couldn't actually pay a company to host that for you, knowing that if they screwed up, you could switch to a provider that did it better?
From a pure engineering reliability perspective, coupling your technology choice to your vendor gives that vendor too much leverage (as we've seen with, for example, VMware).
This isn't about defending the big companies at all. It's about defending the right of hosting providers to compete on hosting a variety of software. In the alternative world of entirely commercial licenses, or entirely BUSL-styled licenses, you would be shackled to the specific vendors that happened to create the technology that you wanted to leverage. This is a scenario where the customer invariably loses.