You know guys this fight is all about money, and not the real fight for who is stronger among them.
I'm not sure if you are watching the fights, they are fighting to prove who is stronger but they also like to make money at the same time, otherwise, they would not spend their time trying to train to prepare for the fight.
They're not fighting for free. Boxing is like any other sport and money has ruined it. Sure, you're fighting for glory but it's mostly about the money these days and taking the biggest payday you can get. Imagine this, what fight do you think a boxer would take? Getting offered $250k to fight arguably the best boxer on the planet in their prime and possibly lose, or take the potentially easier money fight worth multiple millions? Obviously the biggest fights usually are with the best, but fighters usually go with the biggest paydays regardless of who they're fighting. There will be fighters who will want to fight people like Fury and McGregor purely because they know it's going to come with the biggest payday of their lives, even if they know they're no match for them. Heck, I'd even fight either of them for the money I'd likely get. I'd probably be knocked out with the first punch but I'd wake up with a lot of money in my bank account so I can't really blame them.
Wilder is just trying hype the people, he keeps on trashtalking to trigger Tyson to fight him but I doubt there will be a fight from these two this year coz corona virus is on the surface, even the Olympics is set to delay due to the disease so we should be talking E-sports at the moment, it is more feasible to happen.
As Natalim said, Wilder doesn't need to do anything as it's a contractual obligation which he's not going to turn down because it's probably the last and only chance he'll get to win the belts back. It will be interesting to see what happens with the next fight if Tyson loses because he probably will want a rematch clause also so we could be set for yet another fight, though maybe they could agree on a no rematch clause to stop this, but I think Fury would be silly to do so just in case.