Why do you think it sucks? Why do you think it isn't "fair play?" The creator specifically said it was OK to do exactly those things! Maybe not in those words,

Why do you think it sucks? Why do you think it isn't "fair play?" The creator specifically said it was OK to do exactly those things! Maybe not in those words, but definitely in the words of the license under which it was released. Now, if the creator was saying "I got bad advice on this and didn't realize the implications, now that I do my subsequent projects will be closed" I'd have more sympathy. But they're not saying that, they (and you) are arguing that people who look at the project, understand the license, and produce a derivative work that meets the terms of the license are doing something wrong. And that's not the case either morally, ethically, or legally.