This reminds me of a Sinclair ZETA. In 1994 "uncle" Clive released a product which does exactly the same thing as this modern update. Obviously, battery technology has come a long way since 1994 but the basic concept remains the same.
(Unfortunately, like quite a few of Clive's projects, this one was a commercial failure.)
Was something similar on kickstarter a few years back. It was rightly pointed out that any dirt / filth / grime would come up and eventually coat the system. Worst case, for places with lax dog toilet laws, you readily risked getting the device and yourself hit with excrement.
Anyone who owns a bicycle can use the Asus Oxiis E250G1 Intelligent Bike Booster to transform it into an e-bike in just a few simple steps. Equipped with a cadence sensor, it is designed to respond just as quickly as a conventional e-bike, and can be charged via a USB-C charger.
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