As companies that already have funding, what could they offer with an ICO? I mean you can't actually own a part of the company because most of them already has shareholders and even got acquired (looking at you whatsapp) hence there is no chance the "ICO" they do could be considered directly affected by money they make.

Plus there would be a ton of SEC problems they could face if they both make money from selling tokens and also have shareholders, they can't just gather up more funds from ICO without having legal trouble. Which means you either go IPO/angel road or you go ICO road, you can't achieve both and make ton of money.