@StyrgwyrAlso remember, Judgement and Anti-Skill operate on different terms than the dark researchers of AC, publicity matters to them and they're leaders know that. Anderson doesn't need the City itself to ignore him, he just need the law-enforcement not to breath down his neck
The empire Anderson has is "peaceful" so most groups ignore it as there aren't exactly a whole of places you can go if you need serious dirt on someone. His mother is also a Yakuza Princess, I am willing to be against Anderson himself that no gang in AC wants to fight with a legitimate Yakuza clan. Plus he has his own hit-squad made of people who were test subject of AC's dark sciences which makes people even less wanting to go against him. Knowing him, he's also probably in the good with a Director or two.
As for the "taking over a company" part, that's his way of saying "putting someone he can control in power".
And yes, being OP as fuck without actually being OP is on of Anderson's character points. If this RP goes on long enough, you'll understand how Anderson can make his empire so quickly and why he acts the way he does.