> They chose to base their enterprise on the work of others, only to pull the ladder up behind them.

This is literally why BSD exists in the first place. To allow companies compete freedom with the code, including freedom to not release changes.

I hate to break it to you: basically every commercial storage vendor on the planet bases their appliances on either BSD or Linux and not a single one is sharing their proprietary code with you. There’s nothing shameful about it, they built a company to make money.