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I mean it just goes down to whoever uses it first, then all the others effectively never had a time machine.
I mean, depends on the specifics.
If there's a way to detect time travel uses and the effects aren't immediate, that is, it take some time before the actions of the past catches up to the future, then they could effectly be doing MAD across space time.
Like in Terminator, when Skynet sent back the terminators, John Connor did not immediately cease to exist. There was a moment of time for them to react and send their own protectors.