Legislation can mandate the conspicuous publication of a clear indication of the difference between models.
Now, companies can of course lie about this, in theory, but that's a bit like car manufacturers lying w.r.t. emission tests - possible, but you tend to get caught (cf. the recent Volkswagen case) so it's probably not worth it.
Here’s my lazy take: the best governing body to start petitioning about this is probably the EU. If I remember correctly, they already have some of the most consumer-friendly laws on the planet, e.g. w.r.t. planned obsolescence.
Now, companies can of course lie about this, in theory, but that's a bit like car manufacturers lying w.r.t. emission tests - possible, but you tend to get caught (cf. the recent Volkswagen case) so it's probably not worth it.