What confuses me more is for example, the bike in the video by XOXOetc, looks like a mtb to me with smooth-er tires? So when does a hybrid become a hardtail mtb? That bike looks like an older hard tail mtb. Is it when they (hybrids) have 26 inch wheels but then we have 29ers now?

My neighbors have some sort of Trekie hybrids but theirs do not have a front suspension but one has a seat post that bounces up and down when she pedals that makes her rather larger rear jiggle alarmingly. His has no front suspension, 700c wheels, no up and down pogo stick seat post and a flat bar but he sits almost upright. I dunno. Whatever.