If your blood plasma helps save somebody’s life, either directly as an infusion or indirectly in research, that’s not a scam. The monetary reward is compensation for time and an incentive to try to meet demand. The donation is free, but the time and energy required to make the donation are an expense. That’s what the compensation covers. It’s only a scam if your donation goes to feed a literal or wannabe vampire or their bathing fetish.
Kangol flat cap, gray. I alternate between that and a beige flat cap with a closer fit, which is the one that got me into flat caps.