But this page shows several makers that use them: https://www.bosch-ebike.com/us/service/ebike-models#category...
Unfortunately for me, I don't think any of those are sold where I live (Japan). But a standard motor/battery would definitely be a major plus in my book when looking for a bike to buy.
UPDATE: Actually, Cannondale does market a Bosch-powered, roughly-VanMoof-grade bike here in Japan: https://www.cannondale.com/ja-jp/bikes/electric/e-urban/adve...