Ah, conspiracies, conspiracies...
Just for the record: Michelin have to satisfy the top Manufacturers first, notably Honda and Yamaha. The French know this very well, they've done it for many years, always satisfying both. All those who know (and are honest) know perfectly well that even the famous SNS were given to both Honda and Yamaha factory teams; they were not designed for a specific rider (the very idea of designing a tire for a specific rider doesn't make sense, but we keep hearing such things!).
Of course among the types of tire that work well with a certain bike, riders will have their preferences, but that's secondary and riders usually can adjust within that range.
We have just seen that neither Rossi nor Vinales could perform in Jerez, for some (not yet clarified) tire-related reason; whereas both performed beautifully on the 006 tire at Le Mans, and you bet they will both perform as well on the 070 tire, -- why? Because both of these tires can suit the Yamaha M1, and that's what matters: the bike-tire synergy. If tehre is that synergy, riders can always adjust.
Bridgestone created havoc because they were outsiders, who developed a great tire working with another outsider (Ducati), causing the top riders of Yamaha and Honda to oblige their employers to break their allegiance to Michelin and get the superior Bridgestones.
Then Bridgestones promptly forgot Ducati and got busy working with Hnda and Yamaha, just as Michelin used to do (and do now). Honda twisted the regulations as they always do, to effectively neutralize Ducati, and then took Stoner. Ah! That's history.
Now Honda men have said that the Michelin 070 works better with their bike than the 006, a majority of riders voted for the 070, but for some it's all a Rossi conspiracy.
Yawn.