#1. Knowing they can succeed outside but being unable to get out of their contracts
If you're a superstar like Luke Harper, one can only imagine how frustrating it feels being under a WWE contract until later in 2019. He was one of a few known examples of superstars who requested their release from WWE due to creative frustration.
However, Harper, unlike Tye Dillinger and a few others, was denied a release and his contract was extended until November because his last injury spell meant that his contract was "frozen".
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Harper has been open about being frustrated creatively and knows that he can do better outside. Dustin Rhodes, after AEW's Double or Nothing stated that over 30 superstars from WWE texted him, with many considering the company to be like a jail of sorts.
And the sad news is that the rise of AEW means that WWE won't be granting any releases any time soon. The good news is that wrestlers in general now don't have to worry about employment anymore.