If Docker didn't want this to happen, they should not have given everything away for free and then started charging money for it years later. Also keep in mind

If Docker didn't want this to happen, they should not have given everything away for free and then started charging money for it years later. Also keep in mind that Linux containers are based on open source kernel technology and Docker was just a friendly layer on top. Anyone else has always been free to build their own friendly layer on top. All that's changed is that those alternatives are now more compelling.