The issue became mainstream and gave rise to the "Delete Facebook" movement which regular folks as well as celebrities[1] piled onto. It's fair to discuss the faddish nature of the #delete movements, but I don't see any positive angle in it for FB.
It also forced FB to overhaul their platform, most notably applying larger restrictions[2] to the amount of data available via APIs. This wasn't grandstanding, it cut revenue streams for many advertising and data companies. I'm not sure this had a direct effect on FB's revenue, but indirectly it makes FB less attractive as a platform for hyper-targeted advertising. This can eventually lead to a lower ROI on FB ads vs. other channels and thus, lower share of a marketing budget.
[1] https://variety.com/2018/digital/news/will-ferrell-delete-fa...
[2] https://techcrunch.com/2018/04/04/facebook-instagram-api-shu...