That's strait up false... People have posted shots of multiple other drivers doing it, including Max.
For example.
viewtopic.php?p=962059#p962059
I'll counter this with a hypothesis from a different user. RBR told Max to do it explicitly in the hope that the race director/stewards would change their mind. Reason being they thought it would hurt Lewis/Merc more than it hurt them.Sieper wrote: ↑Mon Mar 29, 2021 10:54 pmRed Bull did not complain. They just instructed Max to do the same. Semantics, At which point it suddenly became enforced (not talking about the overtake). If the race director would explicitly feel going wide was OK why then change mind. The simple answer is because it is not OK to ignore the track if that suits your understeered (to avoid rear end instability) car better. Ferrari was nowhere near even the kerbs.