True, it won't really be able to fully help gamblers to avoid the possibility of addiction or unsolicited actions because as you said above it all comes back to the gambler themselves which means that if for example they are one of those gamblers who are obsessed with gambling or those who gamble in the wrong way then they still won't take advantage of the exclusion feature because they will consider that the feature is not in accordance with their wishes which they only want to continue using their time to gamble.

I think the scenario may be similar to addicted gamblers where they are immune to suggestions and criticism, they will not listen to them and will continue to ignore something that does not suit them, so even though for example the purpose of the feature is to minimize gamblers from entering the addiction phase, but still in the end all decisions are in their hands which will make them free in terms of making a choice even though the choice will only lead them to a bad situation. So actually the key to not ending up addicted is always in themselves, in the sense that if for example they can maintain their gambling involvement properly such as always prioritizing limits and self-control then without such features they will definitely do many things to prevent themselves from falling into addiction.