> It's MPL licensed. Perhaps they should have chosen a different license if they want to be compensated.

Or indeed if they wanted to be compensated, they could have moved to an open-core model.

It was their decision for many years to keep the majority of the project as foss. IIRC there were only ever two commercial optional licenses, one for the G.729 codec and one for something else. Everything elee was foss.

They could have sold licenses for this that and everything else, but it was their decision and theirs alone not to.