Wilder touted himself as the #1 fighter and an ATG, whilst ducking anyone north of gatekeeper level... It's hard to get much more fraudulent than that. Joshua got the matchroom hype making him out to be something special, rather than what he has been for most of his career - the best of a weak era. I can't think of a single angle of looking at this question where the answer isn't very clearly that Wilder is the greater fraud.
...but ya'll mustve forgot .. https://3kingsboxing.com/anthony-joshua-best-for-reason/ ''I'm the best in the world and have been the best int the world since I started boxing'' Anthony Joshua.