> I would characterise "Apache Software Foundation, Blender Foundation, OpenSSL Software Foundation, PHP Foundation, Python Software Foundation, Rust Foundation, and Eclipse Foundation" as BigFOSS

While names cited are associated to long-standing well-recognized projects, it strikes me at odd to include Rust Foundation here. Not only the language itself is still relatively new and used in few real life projects, but the foundation is very new (2021).

Moreover, looking at its last annual report, it spent half of it's budget (1.5M$) on "membership & admin". It seems like the true action of this foundation is to beg money from big corps and give it to a few selected members.