Sharing prizes that have not yet been awarded in the current tournament does not constitute bribery. Players are permitted to make such agreements before or during their match, provided that the prize sharing is not offered or accepted in return for the outcome of a game or match, any in-game action, or a player dropping from the tournament.
§ 704.5.b Tournament Rules PDF (officieel)
§ 704 Unsporting Conduct
§ 704.5 Bribery [Match Loss]: Tournament attendees and spectators may not bribe tournament players or tournament officials.