Well, whether they will be successful is a matter for the courts, but they are on pretty shaky legal ground. It's not clearly a parody, they are clearly a competitor and the colours and font, if not identical, are similar enough to evoke the Flickr logo.

I wouldn't be surprised if a cease and desist was already on its way...

> Similar fonts are not the same---if similarity were enough to sue upon then every free sans-serif font would be forced to pay money to the professional font they're inspired by.

You pointed out earlier in this thread that trademarks are different from copyrights, and now pretend to not understand that fact?