#3 Shane McMahon only wants to make special appearances
Shane McMahon usually wrestles a few times a year. It's at WrestleMania, a Saudi Arabia show and perhaps Survivor Series or another PPV in between. He got a bit more active in 2019, competing in back-to-back PPVs on multiple occasions.
He got paid quite a bit but perhaps WWE may feel that Shane McMahon would be better off as a special attraction. Just because he got fired, it doesn't mean that he can't occasionally return for a match at WrestleMania.
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Ideally, WrestleMania would be the perfect spot for him and he could even return as a babyface at some point. While there would need to be a good story to bring him back, it's certainly not out of the realm of possibility.
It's perhaps best that he appears in a role like that rather than being as frequent on television as he is right now. When he returned in 2016, he was a legitimate needle-mover as his match against The Undertaker was responsible for selling tens of thousands of tickets.