https://phys.org/news/2019-03-facebook-privacy-major-pivot-headfake.html

But Zuckerberg's announcement also prompted considerable head-scratching on the implications for Facebook's ad-supported business model, and on the growing pressure to weed out nefarious content and misinformation.

"Should this ambition be realized, it is nothing less than an epochal shift in Facebook's business model," Henry Farrell, a George Washington University professor, wrote in the Washington Post.