Notably, specific Apple apps like iMessage aren’t a focus of the antitrust concerns for the company but rather how it operates its App Store like the 30% commission it takes and App Store rules and how they affect competition and consumers. But Zuckerberg’s comment infers that Apple’s iMessage popularity should be something under investigation by the Judiciary Committee with the subtext “don’t worry about us, look at them.”

Part of Apple CEO Tim Cook’s responses during the hearing included a defense that the company hasn’t abused its power over the years.

Catch up on all the details from the big tech antitrust hearing in our live blog coverage here.