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Can you just rip out all internet connectivity from the Tesla and will it still work?

It does work without internet connectivity, yes.

Does it work without connectivity in perpetuity? Or does it have some kind of “needs to be connected every month” kind of setup?

It will work, you just won’t get any updates. It won’t refuse to drive.

You can just take out the SIM card

Which is buried behind the dash. It's not a "just" thing like you say.

The antennas are in the side mirrors and can be easily disconnected.