I mean, he did sell his blood. Everything has a price, and he had his. It's not like he was coerced or taken without his consent.
I don't agree with what happened, if it happened, however he did it. There is so much pressure, I'm sure, when you are a "celebrity" to be young, to look great, and to still be able to eat and drink like a young adult. Oh, and have the energy of a young adult when you are on stage! I don't doubt they will do whatever they need to to keep it up and look good.
I was the fitness manager for a medium sized city, and I felt the pressure. People would see me at the grocery store and evaluate my shopping cart while they chatted with me. They would watch me workout, and tell me what they saw me do/didn't do wrong. I heard from others gossiping about how I looked like I was letting myself go when I got pregnant. I had to keep up an image people had of me. That was a medium sized town, I can't imagine the pressure they feel from each other, their paycheck, and the public. Look at the pictures of famous people who get older and gain weight... they are shamed. "Skip a lunch!" or "Wow, she really let herself go" Seriously. We can't let people be human. I have definitely gained weight since my days as a manager, and had some kids. However, I don't go to that town anymore, and if I did, I know I would be very self conscious. The pressure was real. Anyhow, my point is he willingly sold his blood, got the money, and Diddy was happy to get it. Doesn't make it right, but we have to stop the public pressure and age shaming too.