I can back up that this is one of the most competitive leagues out there. Although I am biased as I've been racing here since season 1 back in 2021.
Here are some stats to try illustrate the situation. 170 different manager have competed in the first 26 seasons. 71 Different race winners, although only 9 people have won 10 or more races.
13 Different Champions (including season 27 which stats are not yet available for), Of which 9 are still active in the league, holding a combined 22 championships between them.
The really nice thing about this league is that, while it's full of some of the games most competitive managers, the only thing they want is more competition. Come and challenge them. Experience 30 cars crossing the line within 6 seconds from P1 to P30 at Austria. (Ok I think it was 29/30 but close enough right?!)