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Going forward, though, Gizmodo reports you shouldn't have to worry. Google told the tech site "many of the exploits Seely used in the first place have been patched up, so the risk of any new DIY tapping setups by the same method seems slim to none."
Still, exploits like this are fairly common. In an earlier report by Gizmodo, Seely said spammers will create fake listings for "locksmiths, child care services, or carpet cleaners, and … forward calls and other inquiries to different … businesses for a fee."
In the end, Seely says he alerted the Secret Service and FBI of the vulnerability. According to Valleywag, a Secret Service special agent called Seely a hero for exposing the issue.
And of Google and its services, Seely said, "Everyone trusts Google implicitly and it's completely unwarranted and it's completely unsafe."