Yea, this one is to make sure that there isn't going to be regulations on youtube or other social media.

Since no regulator would touch social media regulation because of how that looks, however if it enables people dieing at a unprecedented rate then regulators may feel their hand is forced to do something.(facebook/instagram right now is in hot water with regulators too) I doubt anything regulation wise would help or even be good, this is just youtube making sure it looks like the market is regulating itself.

I think also this is to signal to other users 'see we don't pick favourites anyone can get banned'

They most certainly have a profit motive, they're a for profit business. It's not their only motive, but it's their primary one, and all other decisions they make are judged against their impact on the bottom line, this decision included. They may take risks that they know could negatively impact that profit if (keyword, if) it goes south, but there is still a very clear consideration for cost and profit there.