I mean, if I tell you I'm to sell something to you for 5 dollars and you will be allowed to do this or that with it, and you give me the 5 dollars and then do this or that, it's a bit ridiculous to then have an "outcry" that you were successfull at doing this or that so you owe me more.
Not trying to offend but artists willing to make bird logo for cheap are a dime a dozen, which is why those site exists in the first place, and they didn't care about which one exactly which is why they went on that site to buy it; it's ot like there was any vile or unfair action being done there.