Some implicit assumptions in this thread I consider nonsense. If somthing is cheap and helpful someone will produce it and make profit from it. The big drug companies may not be interested in this drug but if it is free and cheap any new small business company can make money with it and there is little the big companies can do about it.

The big companies may not fund necessary research but there are enough funds available from other sources:
The University of Alberta has been inundated with offers to raise money for human trials of a drug with anti-cancer properties, as recently discovered by a team of researchers led by local cardiologist Dr. Evangelos Michelakis. (just one such information from a quick search)

That's how capitalism works: If you don't do it someone else will and if he has success he will make money from it. Everything else is a myth.

Wolfgang