If they see it as a scam then they seem to expect certain financial gain from donating. In my opinion this is bad as donating life-saving goods should not be done just for the money.

You can’t be scammed if you are doing it for saving lifes (except if they sell the blood to some shady labs instead hospitals).

Jep, the concept of it looks good.

Interesting. As shown in a comment below, it will be difficult for existing shop operators to integrate such a system.

But if your project gets track I see nothing preventing me to create adapters so my service can consume the stream (well, if I really am going to build it).

How would you implement this with Nostr?

I’m planning to create such a platform as a POC for my masters degree but it will be based on Open Street Map or similar. (so don’t worry that I copy your idea ;) )