The biggest issue with this is very few "small" companies envision staying small forever. Who would risk building their company on a stack that you lose the license for if you do too well?

I think what really happened is people didn't quite realize, or didn't think it would matter, what they were giving up when they open sourced their software. It sounds good and feels good but 5-10 years later when it's a core component at major companies it feels like you got ripped off even when you explicitly signed up for it.