Just a wild ass guess, but I suppose Michelin won that just by throwing a .... ton of money at Dorna.
That was before my MotoGP time, but I'd like more than a two source solution. If was only going to be two, you might as well just have one, which is likely how we ended up here. If you had four in the mix, I think you could mix it up.
Or, just change the sole source manufacturer every year or every other year.
The reason they went to a single tire rule was purely for the economics of Tire Manufacturer Marketing. Michelin wins every race now. So clever.
Overall the tire quality was higher with a manufacturer war as it was a competition. So when Bridgestone was outperforming Michelin, Michelin's spend was in the toilet and the risk for the investment was much worse than a 50% chance. At the end of that last season bikes with the Bridgestones were in front.
As soon as Bridgestone won the single tire contract, their tires went to .... and they made tires that were loosing 10cm chunks during the race, it was insanity.
So they switched to Michelin which benefited Honda and was a disaster for Ducati, who then took years reinventing the bike to match the tire Honda wanted and here we are. Michelin is now trying to save money on the tires and they're getting worse.
This is all because of Dorna's business model of high priced exclusive broadcasting = smaller audience = bigger risk for marketing budgets for everyone.
Dorna makes less risky money, Michelin makes money, everyone else is squeaking by or losing .... tons of money = Suzuki out, Yamaha cutting race budgets, Honda cutting race budgets etc. Ducati has made it work taking massive R&D risk and winning finally. They ....... deserve 2023 IMO, 100%. MotoGP, SBK, WSSP.
Dorna sucks.
Prototype bikes need prototype tires, the end.