Traffic "accident" scams are common in other countries, but it's becoming more common in the US now.
This is one very good reason to get a dash cam apart from all the other good reasons: evidence to assign fault in actual wrecks, vandalism, hit and run, etc.
Wire the camera into the car's power (battery or fuse box) with a device to turn it off when the car battery drops to below 11.8v or so. Really cheap on Amazon or may be included with some cameras.
They also make external lithium dash cam batteries that charge when you turn the engine on and supply power to the camera when the car is off -- prevents any chance of killing the car battery and likely lasts longer, too. It allows "surveillance/parking mode" when not driving.
i'm thinking of upgrading my front-only camera and getting one with higher resolution, 360º coverage (front, interior, rear -- maybe side, too), and more channels for more cameras.
Teslas seem to have them already, and there are YT channels just for Tesla-recorded incidents.
I also want a telephoto camera in front to capture license plates. The wide angle lenses on dash cams don't have the frame rate and/or pixels to pick up license plates so they can be read easily especially in low light. Some newer models have the telephoto built into the front camera, or you can just add another single-use telephoto dash cam for this purpose. I notice many drivers will call out license plates when something happens, because they know the camera rarely gets the plates, but the audio will pick up the driver's voice.
It's possible to install a separate camera in each direction, but a dash cam with multiple cameras not only integrates them so you can view all the recordings simultaneously and in synch, but you can also view all the cameras live on the main unit. Good for parking, monitoring the camper or trailer while towing, etc.