AFAIK the motors & batteries
do come just a few manufacturers. But in Europe it seems like some big bike companies are very serious about the e-bike market while in US not so much. A friend has an Indian-made A2B Galvani which is supposedly made with "German technology" & marketed as a touring/city bike. Quality seems pretty good w/hydro discs etc but range is not great, rear ride is punishing etc. Broken spoke took a month to repair since it was a special order item.