It looks like this is an argument about licensing and marketing. Probably PUBG didn’t think Epic would use a similar concept in its own game when PUBG agreed to license the unreal engine. You think you have a business partner who has become a competitor. 

Mario Kart’s penchant for randomness and snowballing make it questionable for skill-tracking and spectation. If items are on, it’s too random. If they’re off, it’s a bit too staid. If they’re limited to some items, one accurate strike can easily settle the race early on and make the remaining laps a huge waste of…

“ The idea is that vehicles lose speed from a boost when they are in the air, so the jumping helps keep the extra MPH for a little bit longer.”