They didn’t. It’s the other way around. After Vettel got a penalty in Canada which led to a lot of criticism, they allowed drivers to race harder. Max in Austria on Leclerc, happened in Hungary too but not sure who, etc. Pushing a driver off track was accepted that season after that incident. Lewis at Monza was the third big incident to be allowed.
Then last year they sort of went back towards their usual rulings. This year they penalize that stuff, as they should because I don’t think we went to see racers win by just shoving people off.