Almost anyone can cut atleast 100€ a month from their grocery bills by just being a little more mindfull about what you buy.

Yeah no. I spent about 150€/month on groceries before, now after the inflations about 180€/month. The only way to safe 100€/month there would be to skip meals.

From what you write you seem to be in the top 1-10% of people by income, and the numbers you put out only work for people in the same priviledged situation.