You’ve misunderstood. Everyone assumed they were just selling user data, what they actually did was overwrite the cookies saying ”LTT contributed to this sale”, so that the affiliate link payment went to Honey instead of the YouTube advertiser. That doesn’t hurt you the customer one bit, but it does stab the YouTube advertiser in the back.
What they did do to hurt you the customer was cooperate with the store, such that the store could tell them ”don’t give the user the 15% coupon code, give them this 5% one instead”.