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The camera is just to alert me.

If it is jammed or attacked.. that should generate an alert.

Even a hardwired camera can be painted or hit with a bb gun.

Lots of people rent and can't install wiring in/through walls.

It might be possible to use copper mesh to shield an exterior camera, with a low-power wifi AP mounted on the opposite site of the same wall, shielded with copper mesh and connected to ethernet. Camera-AP wifi communication would go through the wall.

I can give you a reason:

I want to be able to move cameras inside my business on a whim. The cameras are 99% for monitoring while we're open. They solve many, many mysteries that tend to take place in bars.