It's a mixed bag under Endeavor. Baseline purses are higher, but Endeavor actually took a lot of perks away from fighters.
The Fertittas used to throw around money to take care of fighters whom they liked personally or who did something impressive on a card. Now, there's just the OTN bonuses. Granted, backstage bonuses and gifted cars were used to trick fighters into accepting lower pay because they assumed that they'd get taken care off, but those are still perks that are gone now.
The UFC used to provide customized highlight packages to fighters and camps to study their opponents when Zuffa owned it, but Endeavor put a stop to that practice and told fighers to buy Fight Pass memberships if they wanted tape.
Like we saw last weekend, there's no consistency about when fighters get paid "show money." Ed Herman got offered 10% of his purse when his opponent dropped out at the last minute, but guys who lost fights on Yas Island were paid their full purses. Lorenzo always used to take care of guys who showed up and made weight if there was a last minute cancellation. Zuffa also used to pay win bonuses to fighters who were victims of egregious robberies at the hands of the judges.
With the ESPN deal, the few fighters who get PPV points started to get screwed over because the double paywall on ESPN+ lowered PPV buys. ESPN compensates the UFC for the lower buyrate, but none of that money goes to the fighters. This is the reason why Lesnar refused to fight Cormier. He asked for compensation for the lower buyrate, and Dana said no.