I expect Microsoft, IBM, Apple...to have paid whatever is required.

As consumer from commercial software, and someone that has paid FOSS developers since the mid-90's, I am quite comfortable doing statements about people abusing other people's work.

And OpenTF contributors paid exactly as much as is required.

Yeah right, saving this reply for when OpenTF fork also goes commercial in a couple of years, or fades into obscurity as the big defenders fail to keep it going.

I will give it 5 years time.

Well, we'll see about that. I, for one, can't wait t see the improvements the community has been asking for years.