This is like asking "why don't we live on the moon except that there is no atmosphere there and it's pretty far away?". Those two reasons are the main reasons Youtube is the clear winner in its field, saying "apart from that" does not make a lot of sense. If you'd want to start a competitor to take on Youtube, you either need to focus on a tiny niche not well served by Youtube (extreme far right or far left personalities perhaps, or porn) or you would need to find a way to match Google money (maybe partner up with FB/Microsoft/Amazon/etc) so you can buy popular creators away from Youtube.