It's definitely appropriate that every other item on your list is illegal for minors in almost every country on earth. If I thought we could reasonably keep 'blind boxes' an adult indulgence I wouldn't be opposed. But they are so deeply tied to children's toys, I don't think you could ever have them available for adults in a form that isn't just begging for children to figure out ways to buy them anyway. It'd be incredibly hard to justify banning them only for children, especially on the admittedly abstract basis of psychological harm.
Setting aside that, I believe they should be fully illegal simply on a consumer protection basis. A business should not be allowed to sell a mystery product. There's no justification for it IMO. There is no reason we should allow businesses to sell us useless bullshit and hope we get something we actually want. You can still have MTG, you can still have mobile games. But let people buy the shit they want, or don't. If the business model can't work, somebody else will figure it out.
But of course, there's no fucking chance of that happening here in the US, so I keep hoping somebody else will tackle it (though Brazil's attempt here wildly misses the bar unfortunately).