and with Bonjour/Avahi zeroconf, this should be a totally workable thing - but there are security issues with this approach, and in general its more complex to

and with Bonjour/Avahi zeroconf, this should be a totally workable thing - but there are security issues with this approach, and in general its more complex to implement right and have it "just work" - so they choose the easy route and use the cloud.