I guess I'm curious if I'm understanding what you mean here, because it seems like there's a huge number of counterexamples. GNU coreutils. The linux kernel. FreeBSD. NFS and iSCSI drivers for either of those kernels. Cgroups in the Linux kernel.
If anything, it seems strange to expect to be able to monetize free-as-in-freedom software. GNU freedom number 0 is "The freedom to run the program as you wish, for any purpose". I don't see anything in there about "except for business purposes", or anything in there about "except for businesses I think can afford to pay me". It seems like a lot of these "open core" cloud companies just have a fundamental misunderstanding about what free software is.
Which isn't to say I have anything against people choosing to monetize their software. I couldn't afford to give all my work away for free, which is why I don't do that. However, I don't feel a lot of sympathy to people who surely use tons of actual libre software without paying for it, when someone uses their libre software without paying.