Loading Mass penalties to players automatically on server Join

I already know 2 ways to apply mass to a player:
Via /setmass 100 XXX and through a file with the list of players and mass within a mass.ini file inside 'UserData\LOG\Results'.

But yesterday i saw on this specific server that the players were receveing their mass automatically when they joined the server (on a league).

Was Wondering how is that done?
 
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