You bring up a good point; I'd still say it's harder but not insurmountably so. Maybe a better way of differentiating would be the regulatory hell you'd have t

You bring up a good point; I'd still say it's harder but not insurmountably so. Maybe a better way of differentiating would be the regulatory hell you'd have to go through to sell your cars on a mass production scale. For a router, you could actually get away with almost no testing or paperwork whatsoever (not even with the FCC if you use pre-certified RF modules).