Be Careful what you believe, and who is telling you that.
It is against American Red Cross Policy to pay for blood donations.
Unless you are referring to the 5 in total, Specialized Donors Locations nationwide that do pay donors of very RARE blood types or O neg universal donors for treatment of Blood Cancers with an experimental blast of White Blood Cells...
There exists some private banks that pay for volunteer donations of
Blood Plasma & Sperm & Egg Donations
https://www.redcrossblood.org/donate-blood/dlp/specialized-donor-program.html