https://wccftech.com/facebook-tried-to-buy-surveillance-tools-used-to-spy-on-apple-users/

Facebook wanted to monitor Apple users through its Onavo VPN

NSO Group, a notorious Israeli cyberarms dealer, has claimed in a court filing that in 2017 two Facebook reps had approached the firm to buy the rights to use certain functions of Pegasus, a tool that enables remote hacking and data gathering on Apple devices.