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Those are good measures that you can take, however this assumes that those systems work as intended and I have seen a lot of complains about this not being the case,
some casinos can still send you promotional emails even if you unsubscribe from their list, this could be a mistake or it could be done on purpose but it happens, and self-exclusion is also a hit and miss feature in some casinos, so it is important to always be in complete control of our gambling or overcoming an addiction to it will be very challenging.
I personally think if such things happen, it's a mistake. Casinos have enough customers who are not gambling addicted, and they, casinos, are not so greedy and evil to be taking advantage of sick people sending them promotional emails to lure them into gambling. Don't get me wrong. I'm not saying that there are no greedy and evil people in the world. There are many of them, and, of course, some of them own casinos. I'm just trying to explain that those evil cases are exceptions rather than the rules.