Reach is not size here. The follower range across all 25 is barely 10,000 wide, but average Reel views run from 101,381 to 376,059 - a spread of nearly four to one on accounts that are effectively the same size. The ratio of views to followers, not the follower count, is what the page is actually sorting for.
Eight of the 25 are competing athletes, which is what a 100,000-view floor does to a Spanish micro pool: footballers at Sevilla, Barcelona, Betis, Deportivo and Malaga, an Olympic rhythmic gymnast and a professional cyclist. Club badges push Reels to audiences far larger than the personal following.
The audience barely leaves the country. The Spanish share runs from 78% to 95% with a median of 90%, and the average real-audience reading is 87%. At this size the audiences are local and clean, which is the trade being made against the reach of a larger account.