“Free” is one of the most expensive words in the English language. When big pharma offers something at no cost to you, the bill still exists, it has just been shifted to someone else. Taxes, insurance premiums, employer contributions OR the use of YOU as the experiment quietly cover their costs. The absence of a price tag does not erase the cost.  It only hides who is paying it. 
This is why the same counter that will not hand you free food, water or medicine you need will happily administer a free flu shot. Food and water are private goods with clear individual demand.   Medications are priced according to profit. A flu shot from their perspective is an investment full of case studies, experimentation and whatever agenda they are quietly working.

Always ask questions.  Who profits and who bears the risk?

The same questions apply to every “free” offer.  NOTHING is truly free.
Much Love, Lynn