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Nice although I prefer a crank motor.

I agree. My first and only e-bike was a crowdfunded Mate.bike. It had a removable battery, a rear cassette with 7 gears and it was foldable.

Unfortunately I was too tall for it and was going to sell it when it was stolen. I got more from insurance than I would have sold it for so I'm happy.

The frame just wasn't adapted for tall people and it gave me back ache after 10km.

Why? Could you explain the difference?

You can have actual gears like on an ordinary bike so you can ride it normally without the electric motor operating

Can do that with a front hub motor as well, a very valid option

Does this particular bike (Cowboy) allow that?

Crank motor will allow you to have derailleur gearing (with a chain) or a hub gearbox (Shimano Alfine, for instance) while keeping that nice, low-maintenance belt drive.

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