I do a lot of con/fair/vendor stuff and support. I have heard (but never done because that’s illegal) that among friends it’s very common to not check that flag to save those friends some headache. It’s also a really good way to get scammed if you do it for strangers on the internet.

I suspect that platforms push it down to the users to reduce their compliance burden. Why make life better for your end users by spending some money when you can just make life more complicated for small businesses by having them own everything even the things they don’t know about?