All the discussion about track limits. The rule existed already in the past but was not properly applied.
Remember how Hamilton violated that rule in Bahrain back in 2021. Bahrain was the opening weekend of the controversial 2021 season that ended with the legendary Abu Dhabi final lap drama. Ironically, Verstappen gave back the P1 track position to Hamilton in the closing stages of the 2021 Bahrain race because of a track limits violation. Hamilton won that opening race ahead of Verstappen with only a 0.745s margin. IMHO given the speed and time advantages resulting from dozens of track limits violations, Hamilton did not deserve that victory. A car is supposed to be driven on the circuit, not dozens of times off circuit. He should have gotten a penalty.
The only efficient way to stop drivers from doing this and to avoid annoying penalty discussions: gravel pits next to the kerbs of some violation-prone turns. But likely teams and drivers will complain about safety risks.
29 track limits violations by Hamilton during the F1 2021 Bahrain race:
F1 2021 Bahrain highlights: