That’s a good idea. I took my security cameras offline because there is no doubt that the feeds get sold to whoever is willing to pay.
Even offline may not be okay. Batteries should be out and wires/etc. totally disconnected, and the unit/camera/speakers/etc. possibly smashed, placed in water, etc. too. We have NO idea what additional microprocessors, transmitters, etc. they have added to all this stuff due to those like us who are/become at least somewhat aware.