[kibwen]

It's not hard to find e-bikes with belt drives. Honestly, I think they'll take over the e-bikes market within 10 years or so (I think there are still some outstanding patents?). More expensive and slightly less efficient than a chain, but both of those are probably negligible for the context of e-bikes, and in exchange you never get grease on your pant leg, you never need to lube anything, you never need to worry about a derailleur needing to have its gears realigned or having the chain jump out (of course you could have an internally-geared chain bike).

[ifwinterco]

Motorbikes still overwhelmingly use chains, not sure why but there must be a good reason

[ReptileMan]

Belts are not suitable for passing lots of torque. This is why cvt are not that popular outside of small-ish cars.

[guenthert]

Harley Davidson, among others, uses belts. Torque isn't the issue in the context of m/c final drive. Chains are a tad more efficient, which hp obsessed customers fuzz about.

[jseliger]

Probably the most interesting, cost-effective one I know of: https://lectricebikes.com/products/lectric-one-ebike

[haiku2077]

I have a lectric and the build quality is terrible. Had to deal with:

- a bent frame out of the box - a recall due to defective brakes - lights not secured properly - loose fender after less than 100km - a derailleur that refuses to allow use of all gears- no matter how adjusted it is unable to use either the lowest or highest