Per conf call, it was decided that to resolve any potential compliance issues, the best short term solution would be to notify users that all 3rd party data sources would cause their browsing behaviour to be exposed to the 3rd party. The message (should be short, to be drafted by Legal, could be a link to another page) will be shown in the map's layer selection menu.
TODOs:
- Draft short legal text (in EN)
- Contact extension's authors
- Work with them to fix the issue
P.S. Arielle Friehling is not in Phabricator, please add