Cheaper, quieter, smaller footprint for storage, can be easily brought up a few stairs or put in the back of your car (by one person), slower (a perceived safety advantage by some, as most motorcycles can go highway speed), maintenance is less daunting (again, perceived), culture (perceived) as some people are quite turned off by motorcycle culture, and many many more.

One of the major problems with ebikes is the existence of cars and related infra.

Is $$$ not an advantage? Motorbikes are at least triple the price AIUI, not to mention more regulated. The main advantage of an ebike is that it's basically a pushbike (in terms of cost) but it lets you be lazy and unfit while still using it successfully as if you were fit.

Yes, there's a few extra hundred bucks in cost, and there's an electricity bill for charging it, but frankly that's nothing. You can buy an ebike for 3 digits, and you could include the power bill in that figure and not notice.