When run nothing happens and it is stuck ruining. What is wrong?

The goal of this code is to split a CSV file of soccer players into 3 teams. In the file each player had an experience level, either played before or not. The teams should all have the same amount of experienced and non experienced players.

When I run this nothing happens.

import csv


def add_exp_players(players):
    copy = players
    counter = 0
    while counter <= len(players):
        for player in players:
            if player["Soccer Experience"] == "YES":
                dragons.append(copy.pop(0))
                sharks.append(copy.pop(0))
                raptors.append(copy.pop(0))
                counter += 3


def add_non_exp_players(players):
    copy = players
    counter = 0
    while counter <= len(players):
        for player in players:
            if player["Soccer Experience"] == "YES":
                dragons.append(copy.pop(0))
                sharks.append(copy.pop(0))
                raptors.append(copy.pop(0))
                counter += 3


def create_exp_lists(players):
    for player in players:
        if player["Soccer Experience"] == "YES":
            exp_players.append(player)
        else:
            non_exp_players.append(player)


with open('soccer_players.csv') as file:
    all_players = [{key: value for key, value in row.items()} for row in csv.DictReader(file)]

dragons = []
sharks = []
raptors = []
exp_players = []
non_exp_players = []
create_exp_lists(all_players)
add_exp_players(exp_players)
add_non_exp_players(non_exp_players)
print(exp_players)
print(non_exp_players)
print(dragons)
print(sharks)
print(raptors)