This is different from leaving your personal scooter for a few minutes while you shop, or from someone accidentally dropping their wallet or phone. If you intentionally strew things around in public and leave them there, why shouldn't anyone do with them as they like? How is this not littering for profit?
The reasoning of, "I left this thing on the sidewalk...I have no plans to come back for it any time soon...I hope someone comes along and wires me money to use it for a bit then drops it somewhere else...but don't you dare touch it unless you pay me!" seems specious.
That is not part of the social contract. No one has a reasonable expectation to use the sidewalk as an unattended warehouse or storefront for as long as they like. At best, this is gaming the question of what is or isn't abandoned property.