so that bikes remain accessible?
bikes or ebikes? A quick and dirty fallacy is to equate them. They are quite different, and the innocent connotations of bikes don't match ebikes or the sort of behaviour with ebikes that is being considered here.
Accessible to who?
IMO children should exercise their bodies and sleep at night. 'Adult' means "a person who is fully grown or developed" and the opposite includes someone that isn't fully developed in their mind, and their awareness of others and their society.
A healthy child spends their time growing their body, and a healthy society puts effort into preparing those children for success in life - which includes making it clear that their success depends on the society they benefit from.
Apart from actual disability assistance, I don't think we should permit non-adults to use electric vehicles of any sort - there isn't any good reason. Teaching fulfillment of desire is a mistake - the person who can't say 'no' to themself is a serious problem for the rest of us.
A person that can't say 'no' to themselves belongs in managed care for their and our safety. A person who can but won't say 'no' to themself should be removed from society - there is no reason the rest of us should pay for their selfishness.
Apart from disability assistance, I don't see any sensible reason to allow someone without a driver's license to use a powered vehicle. If you can't manage that minimum, use a pedal-powered machine or public transport which has someone responsible to handle it for you.
Jerks are jerks.
Incompetent people are incompetent.
There is no reason for the rest of us to pretend about that. You DO owe us for maintaining a society that benefits you, and there is no reason we should excuse you.
Buy your own property, fence it to keep children out, and ride as you want there. On OUR property, ride as we say.
And, work with your neighbors, make a case for different road use, and pass new laws.