Obviously people who play by the rules aren't a problem at all. Ebikes aren't legal on National Forest non-motorized trails but it's totally ignored. Every NF trailhead here has the no ebike/no pedal assist stickers on the trail signs. NF doesn't have people to stop it.
Pablo I like rules and try hard to follow them. I have a bell and use it, slow down and stop for hikers and especially dogs. As pointed out above there is a whole new group of people out on the trails who don't know or don't care about rules or trail etiquette and have the ability to go faster than every other legit user. I wouldn't call it malice when others negatively impact my experience.
There's always the argument for the valid use case, elderly, handicapped, etc. of course but they're not the ones creating negative situations. As always a minority try hard to ruin it for the rest and I'm seeing where I ride it's not just a few who don't understand responsible trail use, on the rail trails and in the woods.
@CKN,
you've posted before about your ebiking and one would only hope that you're not blasting by hikers or going on trails not allowed.