The problem is that the trails are "no motorized vehicles", but FL law defines bicycles with electric assist, and a max speed of 20mph on level ground, as bicycles, and not motorized vehicles. Put a gas motor on it, it is a motor vehicle. Put a thumb throttle on the electric bike and it is a motor vehicle.
I don't want to see ebikes on the trails, but until someone of authority makes a decision that can be upheld, I think that there is nothing that can be done to prevent it.