Not a lot of products have to do that. The one people bandy about is McDonalds adding “Caution: Coffee Is Hot” to their stuff, but the actual coffee spill lawsuit was over coffee hot enough to cause 3rd degree burns. Few things need cautions against their intended use.
Q-Tips / cotton swabs are an almost uniquely bad tool. It’s incredibly easy to rupture your ear drums. There’s no actual health benefit to swabbing your ears – it just feels good your ears get itchy. A safer tool could be made, but it’d be more expensive, more involved to use, and there’s probably several but I can’t be bothered to find out, and neither can you. They make a product that they know is inherently dangerous to use and has no specific benefit. So it has a warning against doing it. Same as cigarette packs have a warning that they cause cancer, even though everyone buying them knows that and smokes them anyway.
They’re so insistent on getting people to do their Subscribe & Save stuff, with lots of discounts for making a subscription. And I take the discount and cancel the subscription as soon as it shows up. The entire point seems to be to get people to subscribe at the low price, and then jack the price up, sometimes double, when it starts recurring.