Yes, but:
- it removes only a fraction of it from your body, so it gives only a fraction of it to the recipient.
- if you need a donation, this dose compared to what you get in exchange is usually a very good deal
- some blood don't actually go to people, but is used for manufacturing drugs, science tests or expires
- hopefully people don't get blood transfusions very often and have a blood level of PFAS close to the average and the given blood. Hopefully.