Police still need a warrant for ring camera footage. Its just that overwhelmingly people will hand over the footage if police ask.
"A suspected criminal walked past your house the other day, mind sharing your doorbell cam footage with us?"
"Sure officer, no problem!"
They do not need a warrant if the owner of the camera voluntarily shares the evidence.
It's more like,
"computer, search the entire flock database (which in partnership with ring also includes everybody's doorbell and security cameras[0]) for this minority, and plot a map of their whereabouts over time[1]"
0: https://www.flocksafety.com/blog/flock-safety-and-ring-partn...
1: https://www.flocksafety.com/blog/flock-nova-smarter-investig...
I don’t think they need a warrant if they buy it directly from the company though. A little loophole.