This.

I build and maintain trails for hiking and mountain biking. We build a new trail or change a route and I can just put it in OSM and off it goes into all the other systems. And then I can pull the data back and use it to make maps for planning, signage... whatever.

Google you just give them data, in their format, without all the nice OSS tools that have developed around OSM and... Let them use it. I'm wholly uninterested in contributing to Google, most especially because the barrier to entry is so high.