Why do the top pros play almost exclusively Arabia in ranked games

Out of curiosity, I recently checked the statistics of some of the top players. To my surprise, I discovered that many of them play almost exclusively on Arabia in ranked games mode (take a look at Hera, for example, or Yo).

This surprised me greatly. I wonder why is it like that. Is it about the versatility of Arabia? Or is it because it's hard for them to find a game with a different map with their ELO?