An interesting detailed article about the Facebook data leak:
The leak took place in 2019.
"Initially, attackers offered the data at quite a steep price. As the data began circulating in open and gated cybercriminal forums in 2020, a listing on Russian-speaking cybercriminal forum XSS in August 2020 advertised the sale of this data for “only” USD 25,000 (see Figure 2). Listings were identified across several other forums, such as Raidforums. The sheer size of the data leakage and the wide geography it covered (106 countries) made the data a gold mine for cybercriminals. Therefore, these listings often caught the interest of multiple threat actors."