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Apple might be working on a smart doorbell | TechCrunch
(techcrunch.com)
This is a most excellent place for technology news and articles.
Shhhh, you’ll derail a perfectly good hate-train with that kind of information.
It's also misleading. Pretty much all zigbee devices work locally just by the nature of the protocol, so any company that makes those automatically has that feature.
Zigbee devices are a pretty small minority of the larger IoT landscape. Most consumers are likely to have more wifi or bluetooth only devices than zigbee (at this point in time). The notable exception being Hue bulbs.