Sasha Banks
Like the Revival, Sasha Banks is unhappy with how things have been handled recently. She wanted a longer reign with the Women's Tag Titles but due to losing them at WrestleMania, she hasn't appeared for the company since.
WWE might think that she'll return at some point, but as the days wind down and the weeks pass, that likelihood shrinks with each passing day. Banks was one of the many women who had to sit on the sidelines while Ronda Rousey was Raw Women's Champion, but that was something the entire division had to do.
She's clearly thinking of things outside of WWE as evidenced by tweets like the one below:
She also showed her support for women's wrestling during Double or Nothing. Although she hasn't always been treated the best, she isn't the only one who might have suffered from some less than stellar booking. Her partner Bayley also had some tough booking to go through last year as she lost to both Nia Jax and Rousey.
The Riott Squad also spent a good part of 2018 and 2019 being used to make Rousey, Becky Lynch, and Charlotte Flair look better leading up to their WrestleMania main event. Things likely could have been better on both sides, but she has most certainly been counting her options outside of the company.