Depending where you live this might be illegal. In the U.K. you have an obligation not to record your neighbour’s property, and not to record conversations of members of the public.
Dystopian doorbells: how the humble door buzzer turned into mass surveillance network
https://news.ycombinator.com/item?id=32079896
https://www.standard.co.uk/homesandproperty/property-news/vi...
A very interesting piece of info is that «microphones that can pick up audio from up to 25 feet away». The Evening Standard is a British newspaper, and the article tackles the legal matters, but does not mention audio recording. Maybe an overlook, or maybe concerned people should check the audio related regulations further.
> Video doorbell owners must be careful not to place their cameras in areas where they might breach neighbours’ privacy. Any footage detected outside of your property is likely to breach UK General Data Protection Regulation (GDPR) laws
[1] https://ico.org.uk/your-data-matters/domestic-cctv-systems-g...
[2] https://www.icaew.com/library/subject-gateways/law/legal-ale...