In my locale (Rapid City, SD) we have 30+ miles of single track in two parks right in town (one private, one City-owned) and our city opened the bike path to bikes. Plus our State Parks system allows eBikes on a local rail trail and all State-owned non-motorized single track. Our local BLM also just opened an area with 40+ miles of non-motorized to ebikes. In all cases here we are talking about Class 1 only.
There are 1.2 million acres of USFS land with hundreds of mile of trails that are still off limits to eBikes. However the law enforcement end of USFS has made it (off the record) clear that a Class 1 user on non-motorized trails will not be a primary concern. If they catch you in the act, sure you will get a warning/ticket depending on interaction and attitude of the LEO at the time.
But USFS Law enforcement is NOT going to drive out to bust someone, or set up a sting operation to catch a user. No additional "No bikes" signage is posted as it is a lot of money to bother with.
Generally when poaching USFS single track here, I park in an alternative area to access the trails, maybe ride an extra mile or two of dirt road or paved road to get into the trails. Avoids parking lot interactions with the rare "hater" and ride and let ride.
I own a bike shop and have had stellar success by allowing concerned folks, land managers, and law enforcement to use eBikes. Mainly so they can see what they are NOT. It smooths things over very well. I see the "NO EBIKES" situation precisely where snow boards at ski hills was 30 years ago.