It seems they consider themselves complimentary with OpenStreetMap, as stated on their FAQ https://overturemaps.org/resources/faq/#
Overture is a data-centric map project, not a community of individual map editors. Therefore, Overture is intended to be complementary to OSM. We combine OSM with other sources to produce new open map data sets. Overture data will be available for use by the OpenStreetMap community under compatible open data licenses. Overture members are encouraged to contribute to OSM directly.
I don’t know a lot about any of both projects, but it seems fair.
Another World. It’s impressive how it’s done, the game is programmed in a custom bytecode, and runs on an interpreter for the game. Porting the game to other platforms just requiere implementing the interpreter.
That allowed the game to be ported even to GBA.
There is a blog post that explains everything about it, and it’s super interesting.
https://fabiensanglard.net/anotherWorld_code_review/