As far as I'm aware this type of data does not meet the requirements [0] for a GDPR violation and there was a bit of initial litigation around Google's street view data gathering which left this part out as well (e.g. [1] for a somewhat recent discussion).

[0] https://academic.oup.com/idpl/article/1/3/149/688705

[1] https://news.ycombinator.com/item?id=27517547