I was curious about this at one point in time. I whipped up a full-blown Rube Goldberg contraption that involved a lot of pcap filters on my router and kludgy

I was curious about this at one point in time. I whipped up a full-blown Rube Goldberg contraption that involved a lot of pcap filters on my router and kludgy hacks to Home Assistant for graphing, etc. I even integrated it to a separate LED on an esp32 sitting next to the Echo where the esp32 LED would activate when traffic to/from the Echo was detected. It's a tiny and anecdotal sample but even when looking at historical graphs I never once "caught" the Echo device transferring any even remotely suspicious amount of data unless it was wake-word activated.