This seems like corporate whitewashing of all the insidious things they will actually sell user data for. Like "yeah we sell user data but only so we can make a cure for cancer" meanwhile they are selling it to organizations that are building biometric monitoring databases straight out of Minority Report.
This entire conspiracy theory falls apart once you realize there is more than one group trying to cure cancer, and have cured multiple cancers, as curing cancer is vastly more profitable than treating it.
Once your cancer is cured, you no longer need treatment, and you won't seek treatment if there's a cure.
Cancer cures (and eventually, vaccinations) are an arms race, and only efficacy matters