Which is exactly why I build mine out of Raspberries and Bananas
This is exactly why for the time being I build my CCTV out of Raspberries or Bananas using dummy CCTV enclosures off Amazon. If you add one of the ELP camera modules the result is image quality on par or better than most sub-80£ internet of S**t.
Once "live" the enclosures stop being dummy. The bill of materials is about the same.
The other alternative is to keep the Internet of s**t on its own network and put a firewall in front of it. Less fun though.