Big MEGAcorps should really know better.
IT may not be their bread and butter, but goddam it, these sized corps have resources. They can take the code base for LibreOffice or whatever Open Sourced tool they have and mandate THAT as the corporate standard.
They can even run their own cloud. That's pretty well how AWS started ... spare capacity.
10 person mum and dad store? Nah, I'm going to cut some slack and say "buy one of these pre-canned products".
The MEGACorps can then have their own sub-company to do the IT bit, outsourcing where necessary, but maintaining the tools. So long as they give the source to the parent company, that is ok by GPL.
They can pull updates and patches where necessary but still keep the control.
And that is what the MEGA IT CORPS have. Control. Control means $$$$ (or whatever currency you like). Airbus have taken a bite out of the poisoned apple, spat it out, tried the other poisoned apple and are now chewing on the worst bits of both.
(Shuffles off and mutters something about how does a greybeard get Vulture Capitalist funding to setup cross continental niche cloud for people that value stability over shiny, with Open Source ... Open Stack ... Cloudified LibreOffice, Ceph, my lawn)