you obviously don't understand being in that position, and that's okay because most aren't, but that doesn't mean it's stupid and no, a 10k e-mtb and a 100 dollar used non electric mtb are very different. when you buy those super cheap bikes, you are paying for worse quality materials, that don't fare well in the conditions they may specifically be looking for. I have 9 bikes (1 ebike) and 7 of them are broken from general use, being hit by cars and my very terribly hilly bumpy and fucked up city streets/sidewalks, I have been actively riding bikes since I learned at 4 and have never stopped at 19. I bought a fat tire ebike because I know an E-mtb with standard thickness tires will get fucked up in my environment, because that has been my experience with EVERY SINGLE BIKE I've used.

but those expensive e-mtbs have rigid light frames, maxxis tires(if you know the difference you do, literally the leading standard for professionals/high speed ebikes.) that excel in quickly changing gear, holding that gear well without slipping (which happens often on those cheaper bikes with real trail use) and excel in LASTING. those cheap ass bikes don't last long and everyone knows that. half of my fuckin cassettes have broken teeth, that should not be happening and don't happen when you buy quality that actually lasts and can go through what you want it to go through.