I wonder how many of those could be run device-local on 2-4 year old smartphone equivalent hardware (so, something you could build today and sell for <$300 as an Echo-equivalent) with some kind of trust-minimized cloud backend (or homekit, etc. integration for local device control).
$300 is way, way too much. The echo is $50 base, and usually on sale or discount. It has to be cheaper than an RPi to even come close to matching the price.
