Was at Castlewellan a few weeks back and the place was full of them! I have zero issues with ebikes, except that on this occasion they seemed to be hired mainly by 13 year old boys with no respect for the rest of the trail users. Nearly took my wee girl out as she pedalled up a hill while they flew past shouting “Get her in turbo mode, yeeooooooooo!”
Have to say, I took a little bit of delight when one of them turbo’d their way to a sore crotch on the pump track later on.
Probably just a one off, but if I have the same experience again, I’ll be having a word with the hire place and the park staff.