I guess it would be a matter of legality really. If its legal to be in there on E-bikes then there is nothing you can do about it. If its illegal, and make sure it is, not just your gut feeling, as a lot of places are changing their rules to allow the use of e-bikes, then get the pertinent info and turn them in.
Montana has a lot of areas where no motorized vehicles are allowed. We have walked in five miles before in the pitch black and had someone ride right up to us on the road behind a closed gate on four wheelers. We take a picture and walk out. We get their license plate numbers and turn them in. Very simple procedure to get good results. We have also made complaints about guys on e-bikes only to find out the rules had changed and they were now allowed.
Like I said just make sure of your facts on what is allowed and what is not before you make a move.
Good luck.