[mattbrewsbytes]

A flip on the incentive might be that their core product uses open-source software somewhere in it and the style of open-source license may compel them legally to release any modifications, additions, etc. I don't know which licenses that may or may not apply to and IANAL.

Also for reference, RedHat's entire business model was like this, mostly charging for enterprise support. I use past tense because I have no idea what they do today. Way back in the day that mean when you submitted a support ticket, you might get a developer that worked on the product to help you if it was beyond their initial support triage level.