At least according to the studies, and reports from people I work with and friends, yes, they do seem to work. Here you can read a Google translated article talking about the effects since the law came into effect in Chile in 2016: https://www-ciperchile-cl.translate.goog/2021/05/24/ley-de-etiquetado-evaluando-sus-efectos-en-consumidores-y-empresas-de-alimentos/?_x_tr_sl=es&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp

It’s good to note that another consequence of this law, is that apart from the mascots being prohibited, it’s also prohibited to play ads for unhealthy foods (not sure if they need to specifically target children, or not) aren’t allowed until after a certain hour in the evening, like 9:00pm or something.

Chile started using these some years back. I honestly like them. We also did the mascot ban as well, so no Tony the Tiger, and even Pringles cans have a censored face

Locks, lockpicking, and teaching English grammar.