There's a lot of fraud in taekwondo, and both WTF and ITF are equally guilty. But I have learned quite a bit from the good schools that were in both WTF and the various ITF organizations. All good and bad schools insist on learning the signature TKD kicks, which are high-flying and fanciful, but this does not mean the schools are bad - quite the contrary.
One other thing - many TKD masters or grandmasters or whatever will also claim to be real dojos and even condemn the McDojo phenomenon, but, in truth, they're the Mcdojo operators. Take that observation of human nature for what that's worth.