Extremely annoying. This sort of thing should not be acceptable, an honest mistake results in every place I've been being logged in such a way that anyone with access to my Google account, access to Google servers or with a subpoena can have my full location history in a matter of seconds.
This needs to be a big red option every time you add an account "we're gonna log everywhere you go and hand it over to whoever we feel like, you cool with that?". It'd be different if the log and analysis were done only on my device, but doing this on Google's servers is completely unacceptable by anyone with even the weakest standards of privacy.