Actually, the definition of “motorcycle” varies from state to state. For example, in Nevada, the DMV calls 3-wheelers “trimobiles” and they do not require a motorcycle license, and you’re not required to wear a helmet with some configurations.Not sure what you think those pics are for? Anything less than 4 wheels is a motorcycle- legally- in the US anyway.
So you may think that they’re motorcycles, but I’ll go with the definition and codes applied by the DMV of whatever state I’m in.