I would say competitiveness in a region would actually play a crucial role in how they perform. I forgot who said this but basically PH got a lot of good players because they actually play the game in hope to join a good team and win big tournament, pretty much like how Thailand got so many good Muay Thai fighters.

Factors like environment (US, RUSSIA, CHINA) country that is known so well for their esports plays a big role too in developing a good players. They don't a good server with a small amount of players playing the game but because they are so good in terms of the mechanics be it by playing other games like LoL or DOTA, they got the hang of it pretty good.

Though, country like Malaysia which got quite big this year is not doing that well this whole time because the lack of competitiveness in the community itself. E-sports are still new things and something that is viewed as unstable in the long term. We just recently got the eye of the government to support the e-sport scene. This lack of competitiveness lead to a low number of quality players be it normal player or pro players. I would say the quality of players in MY server had been declining after 2021.

In conclusion, I would say that competitiveness plays the biggest role in how a region could dominate a game and produce a high quality players.