It's early days. This study is a snapshot that doesn't take into account the impact of expanded infrastructure for e-bikes and e-scooters. It will take time to assess of the aggregate impact of more mobility options and adoption of personal vehicles resulting from exposure to shared vehicles.
For example, one element that's sorely lacking for personal ebikes is widespread security. As things stand now, parking them anywhere in public regularly is a nonstarter due to high value and ease of theft. When a critical mass of personal ebikes makes secured parking services viable, then we have a positive feedback loop that encourages more people to use them.
American Sign Language is rooted in French Sign Language, because a teacher at a long-running school for the deaf there came to America to teach.
British Sign Language developed in a different direction, where fingerspelling the alphabet is very different from how it is done in ASL. So even though US and England share a spoken language, signed expression developed differently.
Same deal with signed languages around the world. They generally develop locally and incorporate influences from elsewhere, much as spoken languages do, with the local dominant spoken language having the most influence.