Talked with Samsung chat and been informed that it is not disablable since it is a built-in feature. I also found a Korean news article ( http://cm.asiae.co.kr/article/2016053100193010653), which basically says that Samsung has been doing this since 2016 for all premium TV lineup. (Yes I am a Korean living in US who is stupid enough to purchase Samsung TV in 2019, three years later than Samsung started this customer-fooling business) They say it is a "business strategy", which would maximize their profit, how proud they are! I purchased two 65" Q7 TVs but I am returning both tomorrow morning as soon as I wake up.
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