Private security footage is nothing new to criminal investigations, but two factors are rapidly changing the landscape: huge growth in the number of devices with cameras, and the fact that footage usually lands in a cloud server, rather than on a tape.
When a third party maintains the footage on the cloud, it gives police the ability to seek the images directly from the storage company, rather than from the resident or business owner who controls the recording device. In 2022, the Ring security company, owned by Amazon, admitted that it had provided audio and video from customer doorbells to police without user consent at least 11 times. The company cited “exigent circumstances.”
You should always assume any camera to be hostile, unless you have full and complete control over all related software and connections.
Basically, the people who supplied the device will always have more control over it than you do. And big tech just looooves to abuse that and/or cave in to pressure from governments and police agencies.