Having a price crossed out to give the impression of a sale is just straight up lying. It's illegal here in Norway at least. The product must have been sold a certain number of times for the crossed out price in order for it to be legally presented as a "before" price.
The trouble is that the decoy option in particular can be legitimate—it can be a real plan that you do actually sell, and that does offer more than the usual one; it’s just not needed for most people.
Tell people they must list the plans from cheapest to most expensive, left to right or top to bottom? Well and good; compliance is easy.
Disallow such indication of “specials”? Yeah, that can be done, though marketers will grumble a lot at you.
But the decoy? There’s no sane way of banning that in general, though you could ban some forms of it.
The paradox of choice? Yeah, you could ban this (and doing so would be consistent with opt-in doctrine which is widely used in things like spam legislation), but marketers would definitely growl at you and test the boundaries.
Downthread someone’s mentioned “$9.99” as a form of anchoring. I wish that was banned, e.g. you can’t price within 1% below some notion of “round number”, so that $14,999 would have to go up to $15,000 or down to $14,850.
https://www.forbrukertilsynet.no/lov-og-rett/veiledninger-og...