Fine to rebuild, but (for now at least) quite a few new models, even the ones where telematics is standard, can
have them disabled. The dealer won't do it and will immediately start to mention voiding warranty etc -- mine did --
and I just said it was on them under Magnason-Moss to prove that disabled telematics broke the car, and that's
super unlikely.
It did take the better part of a day for me to silence my Subaru, but that's way less than a rebuild. I unplugged every
single cable to the telematics module, and in a few days the backup battery should be pretty dead as it tries to ping
the cell network through a disconnected antenna. It was a fair bit of work getting to the module but at least it was
semi-accessible, I know some vehicles make it almost impossible, and hopefully I don't need to buy another car
for a long time, but if there's a next time making sure I can kill the spying easily will be the first filter when I look.
Here's the thread in GD from a couple weeks ago discussing this as well.