Who cares about the advertising? The data is in, and the vaccines do both - they decrease your chance to be infected and they make symptoms much more mild if you are infected. The combination of factors is why hospitalisation rates in highly vaccinated countries plummeted.

Or at least they did until omicron. Unfortunately 2 doses of the existing vaccines are pretty ineffective against omicron. 3 doses make the vaccines work better - but I’m honestly a little concerned.