FWIW, I have a personal Docker license, but I avoid containers where I can (because containerizing everything by default has its own set of problems). I use containers as "very fat, stateless" binaries which are run when I need to do something (generate a webpage, take backups, etc.).
People got Docker for granted because startups and modern sysadmins absolutely despised installing software on physical or VM servers. On tech side, Vagrant was making VMs easier, plus BSD had jails, and Linux needed something similar. So they found a legit gap in the stack, and timed it well.
Who wants to spend 3 hours to install a service while they can make it appear out of thin air in 40 seconds and deal with the shortcomings and consequences later, or containerize an application, disregard hard requirements and tell "just add an X container in front" (I'm not telling that this is good, BTW).
So Docker spread like wildfire and graduated to invisible/boring tech in 3 months straight. Then when the people demanded money from developers for what they built for them, people grabbed the forks, or created literal forks of the software. I support the latter approach, not the former one.
However, if they advertise a DSOS program, they should do what it entails. Be transparent, fair and open about it.