Doing the math on this.
These players are ranging from level 37-39
Level 37 requires 9.5mil exp total
Level 38 requires 12mil exp total
Level 39 requires 15mil exp total
As of right now the game has been out since it's earliest release date ( July 6th ) 30 days total. Not taking into account days when the servers were down.
Assuming best case senario you would need to gain the listed exp below per day depending on the level:
37: 317k exp per day
38: 400k exp per day
39: 500k exp per day
Assuming you had a lucky egg proccec at all times this would mean per day:
Lvl 37
3,170 pokestops
Or
793 pokemon caught with excellent throws every time
Or
317 evolved Pokemon.
Lvl 38
4,000 pokestops
Or
1,000 pokemon caught with excellent throws every time
Or
400 evolved Pokemon.
Lvl 49
5,000 pokestops
Or
1,250 pokemon caught with excellent throws every time
Or
500 evolved Pokemon.
Again this would have to be done every day. Unfortunately gyms are a little harder to calculate. But ya get the jist of why these are guaranteed bots.