investigation report on unusual membership signups

https://openstreetmap.lu/MWGGlobalLogicReport20181226.pdf

EDIT ; There is also a reddit article about that → https://www.reddit.com/r/linux/comments/ak7tf9/openstreetmap_foundation_investigation_into/

https://techcrunch.com/2018/12/19/grab-maps-osm-thailand-southeast-asia/