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I guess it is a legitimate security concern. I'm not sure if you have a VPN set up how great of a risk it is, but it could be a vulnerability. I would be in trouble though, my Android was rooted within an hour after I opened the box. There are some pretty handy root apps out there. SetCPU is one I really like for good clean overclocking fun. But beware!!! Rooting opens the door to flashing ROMs, and that is where the real fun begins!
The problem is that a rooted android not only can you do whatever you want, attackers can do the same, and they write malicious code and/or viruses. Then they can use the system root privileges to do whatever they want. Oops, there it goes; executing and populating hostile payloads all over the place. Even though it is hypocritical, since I have rooted my android phone, I would not want a bunch of rooted devices connecting to my network.