What's the issue with Croydon server?

What's the reason for Croydon having so many players? While the oldest servers are around 200 players, Croydon has more than 500 active players and more than 700 enterprises.

Does anyone have a good explanation for that? Is it better to play than other servers (in terms of being difficult, challenging etc.)? 

I don’t see its numbers of players decreasing as in other servers.

I have no clue, why. Still people starting on that server. Even the world is mostly controlled by around 30-40 airlines.