Image quality and photogrammetry is so much better in tons of places. In bing maps, you are lucky of you recognize road marking at all 
Hi @ILikeHighEndGraphics - This is a legal restriction Google Maps places on their services. See Section 3.2.3 (e) of Google Maps Platform Terms Of Service | Google Cloud.
(e) No Use With Non-Google Maps. To avoid quality issues and/or brand confusion, Customer will not use the Google Maps Core Services with or near a non-Google Map in a Customer Application. For example, Customer will not (i) display or use Places content on a non-Google map, (ii) display Street View imagery and non-Google maps on the same screen, or (iii) link a Google Map to non-Google Maps content or a non-Google map.
If you have subscriptions to imagery from other data providers, you may choose to use those services in Cesium for Unreal that use common open standard for imagery.
If there is a common image open standard data locally, how should it be used?
Is there a more specific tutorial? It is best to start from scratch and adapt to Cesium for Unreal step by step.