My small adulting triumph for the day: remembered to make my car honk as I walked away from it in the airport parking lot so now I don’t have to spend the entirety of my trip intermittently worrying if I locked my car! 
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I’m not sure I’d be comfortable with that being web controlled. I’d also never put the door of my home online, for the same reason.
You can turn mobile control off if it's a concern. I'm personally not worried about it