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While I get your point, I think it's a case of the perfect being the enemy of the good. This project is miles away from being a Ring doorbell.

I guess the author found the ease of use of an ESP32 to be an acceptable tradeoff (or didn't consider its firmware to be a problem). Others may feel differently, and can modify their build accordingly.

The ESP32 can barely do what you want it to, let alone also run a yet undetected meaningful backdoor which will impact your privacy.

And even if it did run a backdoor, you've got all of your cameras on an isolated VLAN which can't access the internet (or anything else), right?

> Is [Espressif] firmware fully open source and contains no backdoors?

Their SDK is Apache licensed but does include some compiled radio-frequency stuff: https://github.com/espressif/esp32-wifi-lib/tree/master/esp3...

What would be a good alternative that doesn't have binary blob tho?

Block it at the router level to allow only LAN?