Let's see, should President Trump release a Weapons Dealer with massive amounts of American blood on his hands, for a political pawn who did nothing wrong outside of thinking Russia is a nice tourist location? Yeah, I wouldn't do that either.
Also keep in mind that President Trump successfully executed lo less than 3 releases of prisoners in North Korea, and gave up NOTHING.
Russia released Griner because they knew Biden was weak, and sucks at negotiating. For the value of Bout alone, we should have gotten almost all political prisoners back. Russia literally beat Biden, while at the same time insulting the LGBTQP community by telling them Griner is of no true value.