Some platelets can be given to & received by any group, so whereas some 30-40 years ago, you popa_bar_abba would have solely been the “universal donor”, nowadays you are not solely the universal donor, just as “AB” is not solely the “universal recipient”.
As an aside, vis a vis Tzedokoh:- You are always better off to be on the giving end, and not on the receiving end; Even more so, vis a vis blood.