True. It's really cases like this that demonstrate the shortcomings of BSD/MIT licenses -- at least if you are of the position, that companies could and should contribute a sliver of profits back to the projects enabling that success.
(Much like contributing back in taxes for the infrastructure used and the educational system producing the qualified employees. But that may be a bridge too far for some of HNs readership :) )
Can't speak for all of the projects, but tz is intentionally public domain.