While testifying in court, the Meta CEO said WhatsApp and Instagram probably wouldn’t have been successful on their own.

The trial between the US Federal Trade Commission and Meta began this week—and the future of the company is at stake. The FTC wants Meta to sell off two prized assets, Instagram and WhatsApp, arguing that it acquired them illegally to suppress competition.

Mark Zuckerberg floated the possibility of spinning off Instagram from his social media empire amid rising regulatory scrutiny of the technology sector and an increasing concern that the photo sharing app was “cannibalizing” the success of Facebook.