Marshall has copyright on his lyrics, you just said yourself patents and copyright are different things.

Sufficiently different rip-offs that don’t confuse consumers as being the original should be legal. They already are as far as copyright is concerned.

Many design patents should never have been registered, and should lose when defended in court. Design trademarks are a third similar issue.

It doesn’t actually matter too much. They use mostly our data, so legally I think it’s ODBL too, and we can import anything genuinely useful they do.

Overture is a separate project so they can add stuff OSM doesn’t want like data generated from imagery that is not checked by people. That might make Overture better in areas where osm data is sparse. They can also restrict other things only import tags they like, or merge some tags that mean similar things to make it easier for data consumers.