So all these fake accounts - people are using them (active). Ads are being displayed, activity is happening, Facebook is making money on every single one of 955MM accounts.
So what makes them phony?
Let's start with the fact that in the article, a 13-year old girl is using multiple accounts to play games, and nothing more. Yes, she logs in and is counted as an "monthly active user". Yes, ads are being served to her. That's the problem.
She's one person. But as far as Facebook (and, hence, advertisers) are concerned, she's three. Do you really believe the demographic information she's entered in the fake accounts is accurate? Do you think that she uses the fake accounts with the same commercial intent? As someone who himself has multiple accounts, I'm skeptical.
Let's suppose some of these services use real workers to log in to each account. Each worker will log in how many thousands of accounts in 30 days? What Ad will they respond to unless they are also being paid for click fraud?