You appear to be viewing software licensing as a zero sum game. How has Hetzner's use of open source virtualization software harmed the original author of QEMU, Fabrice Bellard? Back in the early days of QEMU, there were bugs. Lots of bugs, as hardware emulation is complicated. By releasing QEMU under the GPL, the project gained lots of users, and some of those users started fixing bugs. Because Fabrice chose to license QEMU under the GPL, users were forced to publish those fixes back to the community. Companies that decided to use and build on QEMU made it better. Parasites only take, while FOSS makes sure that users give back to the original project.
Why is it that software developers, like Fabrice Bellard, choose to use FOSS licenses rather than a software available license? Do they receive zero benefit from choosing a FOSS license? No. They receive the benefit of other people using, and then improving the software they originally developed, which in turn feeds back into building a stronger community that supports the software.
SAMS has barriers to entry that FOSS does not, and it fails to protect certain developer interests that FOSS licences protect. Those barriers to entry and rights matter to authors of FOSS. Developers who believe in FOSS will never adopt SAMS licenses, because SAMS doesn't protect the rights those authors value in the way that licenses like the GPL do. You're free to use whatever "software available" license you want, but people like me that value what FOSS gives back to us will never come around to your viewpoint because you do not value what we value.