I only ever got one ad in RIF, repeated in every spot. I think it was an app for organizing decks in TGCs, but as I don't play any TGCs, I never bothered to investigate. As with every other ad on the internet, I only interacted with it by accident.
At least last time I donated blood in my country (Canada), you could discretely indicate "do not use" by applying a different sticker to the bag. This was done in case someone got peer pressured into donating but didn't want to reveal something private that would have disqualified them otherwise.
it's why I'm here ( lemmy.world )
saving lives is hot ( i.imgur.com )