I am reading so much incorrect information in this thread it’s maddening. The card network (Visa, Mastercard, etc) do NOT make money on Interchange. It’s hard to have a healthy dialogue on this topic if folks don’t understand the basics of how the card networks generate revenue. Below is a decent primer. https://www.investopedia.com/articles/markets/032615/how-mas...
I mean, technically no they don't. But that's just being pedantic. They charge the bank based on gross dollar volume, and the bank gets the money to pay for that from... interchange fees. The more volume the bank does, the more they pay and the more they get from interchange fees. Interchange fee pricing is set based on how much mastercard charges the banks, so while technically true, the interchange fees are basical…
But..... You have the main point here. The whole premise of monopolies is that monopolies dominate bottlenecks, and use them to generate outsize revenue and protection from competition.
Facebook doesn't make money directly from whatsapp. It can be used to generate data for FB's main advertising business. Most importantly, it helps maintain facebook's dominant position in social media. That position is revenue generating.
I agree that understanding the mechanics are important. But, we can't keep treating monopolies as innocent of monopolistic practice until proven guilty. The reason we have antitrust in the first place is that monopoly positions lead to monopolistic practices. We need to assume monopolistic practices exist in the case of a monopoly. When one monopolistic practice (eg amazon marketplace or adwords) has been proven in court, this should be treated as proof of monopoly, not a standalone violation.
Same with the CCs.