Comment by wakawaka28

>No, everything was already open source, other had done it before too, they just made it in a way a lot of "normal" users could start with it, then they waited too long and others created better/their own products.

They made a unique contribution which was significant in its own way. It doesn't matter in the end that others tried to do related things before and failed to get traction. They could have made Docker more restrictive to make money, and they didn't. Open source is hard to actually make money with, unfortunately for those of us who enjoy it.