[Edi]

This actually falls into the category of good service, BUT ONLY IF it is made very clear upon signing up for a Google account that it happens.

They do provide a way to remove it and it is not accessible to outsiders unless you have given them your password. The authorities will be able to get it via court order, the same as they can get your phone logs and other such information, though with all the hoo-ha and shenanigans about warrantless wiretapping, I would not trust that to be the de facto state of things (even though it should be).

Potential employers would have no way of getting that information unless it was something required for background checks in professions where it is necessary, and in those cases they would have to go through the relevant authorities who would require the relevant warrants etc. I have no idea of the privacy laws in the US, but I know they are less strict than ours, so it is possible that even unrelated information that came up that way could be used against someone, but here it would be forbidden.

Also, one starts to wonder how this service would gather all the required information when you are not signed in to your Google account. If you periodically clear your web cache, browsing history etc, where the hell would it get the information? My browser clears everything automatically every time I close it.

In other words, this is not as intrusive, drastic and draconian as it sounds at first glance and what some people may make it out to be. It is potentially a very useful service, but it also has potential for abuse. As long as you keep your wits about you, disable the thing and in general follow good privacy practices yourself, this is no problem at all.

It just happens that most people are clueless morons about stuff like this and never pay attention to all the forms they sign and approve and thus it is such idiots who will get it in the arse if this turns back and bites them. Then again, they will just reap the consequences of their own actions and stupidity, so I can't really feel much sympathy. Unfortunately, it's this subset that generates the most noise too.