What you're saying would be true back in the first two weeks of Hydatos release. But now, in all the time I spent in Hydatos, I have yet to see the premade group enter act as if they own the portals and are bossing people around. In fact, I see the opposite happening quite often. Just yesterday, a player that was known for sniping many runs have been rallying up people in shout chat telling them to take a portal if they can, just because they knew there's a premade there. What did the premade group say in shout chat? nothing. In fact even on VC on discord they said "The sniper is not breaking any TOS, don't engage with them in shout chat". Others in the instance of course replied back to them, but they were not in the premade group. And the main reason the sniper was doing that, is because they were kicked from the discord group breaking the rules of not sniping portals from other runs (even though they got the mount with the discord group help lol).
What did the sniper accomplish by doing that? They got two new players that had no idea what's going on killed and deleved (one of them took one portal from the first set and the other took a support group portal). The sniper made it sound in shout chat as if BA is like an event that just started and everyone should jump in to give it a try. And didn't even mention that the premades are going for an Ozma clear and it will get a new player killed easily. And on top of that, after AV was killed, the new player that took one support portal obviously died. The sniper then started saying in yell chat "this guy that died is new. You guys should res him". I really felt bad for the new player that got trolled by that sniper. They didn't even have their Eurekan weapon and most likely took the portal because the sniper was shouting all the time that people should jump in and try it, while the premade group said nothing in response. The group got the clear in the end and more than 10 players got their mount.
So what do I see from this? The discord group helps new players clear daily and get the mount, while the other side that is advocating sniping a portal from a premade got a lot of new players killed.