Article 27.3 Formula 1 Sporting Regulations says: “Drivers must make every reasonable effort to use the track at all times and may not deliberately leave the track without a justifiable reason.
“Drivers will be judged to have left the track if no part of the car remains in contact with it and, for the avoidance of doubt, any white lines defining the track edges are considered to be part of the track but the kerbs are not.”
By allowing cars to go wide unpenalized they effectively introduced rules that conflict the sporting regulations. Yes, those 'alternative track limits' were declared upfront and RB should have used them given the information - but the problem is that such alternative track limits should not be there to begin with. The regulations are clear, the white line is the limit, and there is really no reason to deviate from that.
We've also seen in the past (USA) that drivers were not penalized for consistently breaking track limits during regular racing, but once Max overtook on that location outside of the track, he was penalized immediately. Which literally means that there were places on the track (aside the pits) that you could drive without being penalized, but could not overtake. And that's not fair racing. The same track limits should apply to any situation, whether you drive in the void or are actively battling. Those regulations are there already, but the FIA should actively enforce them. (and yes, sure, there are overruling situations - a push of the track, a braking mistake... but it shouldn't be hard to distinguish incidents from structural behavior).