Before Bing, Yahoo allowed OSM to trace.
And others followed suit later, e.g. DigitalGlobe
Re:Google Maps: Bird Mode
by anticensor on Sunday February 24, 2019 @04:48AM
(#19237933)
If I recall correctly, founder of OpenStreetMap worked at Microsoft at the time.
Bing also allowed OpenStreetMap to use its aerial imagery for tracing. This helped OSM a lot!
Google, on the other hand, asks users to help them with their proprietary data with no compensation.