It sucks that Google is probably using OSM data to check what they are missing and adding it to their maps, but we can't do vice versa. OSM should change their license to something like if you use our data, you have to make yours open as well.
Change that to definitely. I added a brand-new road on OSM and a week later it was on google maps.
The license seems to already require this: https://www.openstreetmap.org/copyright/
Maybe I am misunderstanding the summary, but it says: "If you publicly use any adapted version of this database, or works produced from an adapted database, you must also offer that adapted database under the ODbL." <https://opendatacommons.org/licenses/odbl/summary/>