Except that boxing has the Ali act, federal law that limits what promoters can get away with in terms of exclusivity.
Also, boxing's revenue splits are waaaaay more favorable than 20% for the athletes.
I'm with you as far as "Then dont fight, test free agency and let them compete for you."
But that would require the UFC to willingly release you.
I'm sure that many of these money disputes will dissipate once live crowds return. I think Dana is doing his best to mitigate their funds until then.
Hopefully they get it all figured out.