You got it! According to the statistics, Top-10 richest Dota 2 players list consists exclusively of athletes who won The International tournament. The prize fund of the Dota 2 Mundial championships is multiply times higher than all tournaments' money pool taken together. Even seasonal Major challenges don't cross the 50% edge of the TI prize pool.
This next list represents the Top-10 players in eSports who won the most money according to free information published on the Internet. Keep in mind that this list hasn't been updated since the last Majors:
The first "great" five eSportsmen in this roll won TI8 and TI9 in a row as OG roster. As you can see, N0tail outperformed even his teammates' thanks to top-3 places at four Majors (2021). He earned approximately $800,000 in all. JerAx and ana have two Major victories in their professional career because they joined OG quite later. Ceb and Topson became OG players only before TI8, so they do not participate in Major tournaments as part of OG.
The next five lines went to the players of the "legendary" Team Liquid roster, which took victory at The International 2017. KuroKy, Miracle-, MinD_ContRoL, and GH received more than 890,000$ each, thanks to second place at TI-9. However, not one of the cyber athletes participated in The International 10 because as you remember how Nigma team did not pass the qualifiers stage in the Europe division. At TI-10 world championship, only MATUMBAMAN, together with Team Secret, took third place and earned $720,000, and then they lost to Team Spirit 2:1.
Surprisingly, nobody from the CIS region got into the global top-10 list, exclusively pos-5 of Team Spirit roster Yaroslav "Miposhka" Naidenov, who was the closest to the Top-10. Yaroslav was in 11th place with $3.93 million net earnings. Of course, the biggest snatch he received at TI10 — was $3.6 million. Another $123,000. Miposhka won at The International 2017 as part of Team Empire, which took 7-8th place at that championship. Generally, Top-10 list is still "European", but I hope that the coming Dota Mundial championships will change this mainstream.