It seems to me this is a product for almost no one. Inefficient delivery of power, bulky, "smart" detection in stead of reliable operation and most importantly, the only target market I could imagine cannot use it. Not sure about other places and climates, but over here, most bicycles have fenders.
Bicycles without fenders are typically used for specific recreational activities and those sure as heck do not want this clumsy thing attached.. If they want any form of electrical assistance they would want it a lot more sleek and efficient.
Other than that, it reminds me of the Spartamet, a Dutch piece of tech from 1985 which added a small combustion engine to an otherwise regular city bike.
I can see one audience: someone with a bike they already like who only occasionally needs assistance and wants the whole thing removable
Once you try a (good!) electric bike, you don't really want to go back. Life is just so much better. For urban commuting, you no longer think about heat (getting sweaty), distance, inclines, wind, etc.
Obviously I'm talking about good electric bikes, with mid-mounted engines that detect pedaling strength. These feel great, unlike electric motors strapped to bikes, which feel like, well, electric motors strapped to bikes.
If the road is even little bit wet like after rain or morning mist, the dirt from the road ends up in your backside without fenders unless you drive very slowly.
Find a bicycle without mudguards and ride very slowly, or just ride on clean roads on a sunny days.
When it's wet, the engine will have less traction too.
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