What is your take on implementing a global temporary ban on using online gambling platforms using Blockchain+KYC to prevent people from getting addicted to gambling?
So... if we look just to technical aspect, I'd say this is completely possible, but think about it with me... would casinos really be interested to implementing something that would limit their customers and reduce their own revenue?

Who knows, assuming the government implements this kind of method and put it on their regulations requirement, would the casino dare to not comply? If the government does not care then casino won't do it because it will drain resources from their end, but this as I said, does not undermine how this method can help with combating gambling problems.
Another question: link KYC and the blockchain is interesting, but it comes at a high cost to our privacy... are we going to let casinos further centralize and monitor our data?
If casinos (all legal casino) require us to undergo KYC and link it to our address, then we have to comply; if we don't like we can avoid the casino, and that will help solve the problem and help in preventing gambling problem since people will choose not to gamble because of the requirement.
What would prevent less honest casinos to use this to illegally collect our data?
This had been an issue ever since KYC is implemented so this is not something new that sprouted because of the method suggested. So, whether Blockchain + KYC is implemented or not, this problem is already present. The answer to the question lies in the government's action against these crimes.
In practice, I dont think this would work because depends of the cooperation of several platforms. There are so many platforms that many will certainly not join, making it useless and only limiting the revenue of some casinos... this is a very competitive market and adoption would be really low... I think.
True, I agree that without a centralized authority to command these casinos to set up such a system, possibly the majority of the platforms won't comply. But saying that the method is useless is an overstatement IMO, it just need regulatory board to force these casinos to cooperate.
Did anyone knows that UK GAMSTOP forces casinos to cooperate since 2020 in terms of Self-exclusion?
The Gambling Commission has today announced that all online gambling operators must participate in the multi-operator self-exclusion scheme GAMSTOP.
The scheme that has been developed for the online sector will allow consumers to self-exclude from online operators with one request rather than from each operator individually. With over 200 online operators this will make access to self-exclusion much simpler for those who wish to be prevented from online gambling.
You can read more detail in this link :
https://www.gamblingcommission.gov.uk/news/article/online-operators-required-to-participate-in-gamstop-from-march-2020