Welcome to the forum Hopeless.
That scenario you only have a couple of choices.
1: A smart camera that stream events to the cloud, but i am not sure how well such a camera would handle a event like a camera snatching.
2: A system with one or more cameras remote like the SG9663DR - mini K2S and a few others, these have their cameras on wires, so any snatching and they will just get the camera, the main unit with the memory card you can hide.
Main drawback here is none of these systems have a IR aided camera for cabin recording, i think SG planned to make a optional one, but corona and now the boss having had surgery i am not sure about a time frame.
These cameras will most often get a good shot of people entering your car with the cabin light on, maybe change that light to manual so you can keep it on a bit longer, also the cameras are okay low light performers so in the ambient light of a town at night the footage will not be all darkness.
The A139 do have its cabin camera with IR light on a wire too, and you can get a lock bracket for the main camera so as i understand it you cant just slide it off its mount or turn it off, you will have to pull it off the glass, and in strait pull force this actually take quite some muscle to do.
The cabin camera for instance mounted like mine on the mirror stalk, that will probably be what a emotional person would lunge for, so in that case the memory card and recordings are safe in the main camera on the windscreen.
As Hey Hoser say you could always tell a little white lie about your cloud security, most people would not know / have a clue, maybe have some stickers made for the car ( cloud security cameras recording ) just to discourage any smart ass behavior before people get into your car.
3: there is professional systems for taxis and commercial vehicles, but there have some issues not least on price and image quality.
This is daytime cabin footage ( middle 50% in hight of each camera ) the central mounted A139 from viofo, and the somewhat offset viofo T130 we are testing on and is not yet launched, this model have the front and cabin camera in 1 unit, so the T130 i dont feel are best suited of these 2 models in regard to camera theft.
your Nextbase 522GW are probably the most unfortunate design in regard to dashcam snatching, it is right there almost like a handle to just grab and pull, and as i understand it is just a magnet holding it in place to the mount, so would take very little effort, meaning even a drunk " Karen " could do it.