The Moraine Lake Highline Trail in Banff National Park is off limits to e-bikes as are most/all backcountry trails there. I would love to ride this singletrack but would likely receive a lot of flack from other non powered riders. I’ve already had someone threaten to report me during a ride along the Goat Creek Trail.
We have a network of informal trails that are technically illegal for ebikes ( illegal for ANYONE to use) , but they are almost exclusively used by ebike riders and nobody is concerned with policing them. They were hand cut 30+ years ago for hard core motorbike use, but for numerous reasons ebikes have replaced motorbikes. The local network would be about 1000 km of trail , but it could relatively easily be linked to other similar networks across the great divide .
I have mixed feelings about formalising these trails +/- making their location public knowledge. 20 years ago there was an individual who produced paper maps by walking our 4x4 trails and detouring along the single line tracks he saw - the tracks he mapped were destroyed within a couple of years by less capable riders mistaking ambition for ability. We already have a HUGE network of formal mountain bike tracks - I doubt there is a person alive who has ridden every formal mtb track in Australia - and yes, ebikes are welcome on all of them.
Which brings me to - places I want to return to now my kids are a bit more capable....Thredbo....unfortunately my daughter has emotional baggage because of covid cancellations to racing there in 2019 - she was at peak performance and would most likely have earned a podium position -covid effectively ended her mtb racing aspirations. This was her in 2018 at 12 yo... Thredbo is amazing - chairlift up, then you can choose between hurtling down black runs or wandering along the ridges on blue runs like this. I really should take my 14 yo son there in spring.