There's no money or fanbase behind Yarde so he'll be very hard to make popular and monetise in the short term.... The only reason I could think of it being rigged is if the odds are so large against against Yarde and underhand entities bet massively against Beterbiev and make a fortune via homecooking means. Hopefully Beterbiev just smashes his face in quickly and there's no doubt left.
The promotional power behind Yarde is absurd for such an ordinary, club level fighter. He is one of the most privileged boxers I've seen in some time. He still doesn't have a notable win, has two losses, and is getting his second title shot, this time for THREE belts. Adidas sponsorship out of nothing? Very strange...
I think Beterbiev will not be motivated, like he was with Smith. He wants more belts, so I think Yarde can go longer than Smith.