These feats come in two categories. The first are Horrifically Overpowered Mythic (HOM) feats. These are follow-up feats to mythic feats from Mythic Adventures, specifically designed to take the mythic rules to an illogical conclusion beyond their intended scope. Second (and listed in their own alphabetical order after all the HOM feats) are the Mythic Horrifically Overpowered (MHO) feats.
These take already-extant Horrifically Overpowered feats and tack on the power boost of having Mythic versions available. All these feats follow all the rules and restrictions of mythic feats, they are just horrifically overpowered when compared to 'normal' mythic feats. Adding any of these to a campaign is likely to break it.
Seriously, don't use these.