It's only that simple if it's all written by the same person. A maintainer can't just re-license the whole project unless all other authors agree (or already a

It's only that simple if it's all written by the same person. A maintainer can't just re-license the whole project unless all other authors agree (or already agreed to that e.g. by accepting some contributor agreement). Or did you mean a price high enough to just ignore the existing license?