Very cool. It doesn’t sound like much, but you can actually do stuff with one reliable qubit.

Graphene

And it’ll be affordable, right?

Maintain eye contact in meetings while texting in the front pocket of your hoodie, of course.

But in seriousness, if you have a smartphone, you already have access to a terminal, a relatively powerful local processor, connectivity and plenty of remote options, but it’s also likely much more expensive than a pi. So the reasons are IMHO:

1. Hackability (full access to hardware capabilities)
2. Physical keyboard (assuming good build quality)
3. Relatively low price
4. SFF native linux
5. Novelty/cool factor

Edit: answer seriously

Good news! They can already do this!

The only existing direct interfaces I know of are cochlear implants. You’d have to pair them with something that can play an ad, like a phone with Spotify, but they can deliver it directly through the auditory nerve to the cochlear nucleus of the brain stem.

What a time to be alive!