This is the gaslighting that we all went through from the very beginning. It's what made me take so long to understand the problem.
"Your data" is the photos you upload, the messages you send, but "their data" is all of the metadata: when do you post, when do you log in, where are you, who do you message, who do you message more, and later they said fuck it: how old are you, what is your sex, and what is in the contents of your message?