They certainly CAN monitor all of this.. but a lot of them don’t. I don’t think it really matters if the mouse or something is yours, it’s really about the computer itself. The policies and practices vary between companies. Are you suggesting there might be an issue because they are ‘using your resources’ to do this?

Would be interesting to see the liability a company opens themselves up to by monitoring an unaware employee with a webcam while they work from home though!