The comment I replied to was suggesting doing these panels as part of donating blood as an added incentive, but was worried that people would intentionally donate while unhealthy in order to receive free lab work.

I said that isn't a problem places where medical lab work already has no cost, as no one would be incentivized to donate blood just to receive lab work.

Not sure where this got lost along the way since this is one of two comments effectively replying to the same misunderstanding.