Here's my two cents:
I think that because BYC has such strict rules regarding it's users using content from others without crediting it, it would be, in my opinion, the right thing to do when crediting media it uses. I'm not trying to undermine the rules, it just seems more fair that way. It's up to BYC to decide whether they want to be nice about that, as it is in the rules that they technically have the privilege. Personally, I don't think that it would take too much effort to credit the creator with something like '(Image credit: User_xyz)' but that is still my opinion. I understand that BYC technically has access, but I think that it would be the fair thing to do. I understand that my opinion of 'fair' ultimately doesn't matter, and it is up to BYC. I understand that it is, as of the current setup, technically the person's fault if they don't watermark their image. I understand that life isn't always fair. I was just thinking that in such a kind community, people would want that courtesy reflected back at them. This is only my opinion, and I respect if you disagree with that.