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Amazon is forcibly upgrading Prime members to Alexa Plus, and users are not happy
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Do you need the doorbell hardware itself to be open source? Or just compatible with self hosted open source software?
If just the latter take a look at Reolink products. You can block their internet access and they still work great locally with Home Assistant and whatever NVR you want. DoorBird and a few others have HA support as well.