I always hate that people do this instead of distancing themselves from the IP (at least enough for plausible deniability and to avoid automated detection). Especially when the work they made from scratch exceeds what they re-used, often a case of don’t use trademarks in the name. Though when it comes to map data I don’t know how much you could do (maybe jumble it up a bit or create some kind of procedural generation) unless it’s just a spiritual successor from scratch.

Similarly, I’d be interested in new asset packs(/games?) made for free engines (that don’t have assets OotB, thus don’t function). Though I know that is also more likely if it only needs textures/sounds/models and not map data (which I am not sure if included map data is a thing/common).