I don't think a conspiracy is necessary here. Three factors are at play:
1) It needs research. That takes a long time. 2) If its successful and good, the effects need to be studied in patients for years to understand the long term impact 3) Capitalism is going to try and optimize for profit, not for welfare. Which is the point you are making, except... it's not conspiratorial. Capital absolutely is out in the open about this.