I liken the pot splitting issue to how it's seen in poker -- where generally, no one cares (and it's actively facilitated by the poker rooms when all of the players remaining can come to an agreement) unless the tournament is televised. At that point, there are more considerations than just the players -- you have to worry about the viewing audience and the sponsors and advertisers. Nobody wants to watch a rigged final, and that's the issue I have
One way that these tournaments kind of enforce that is through taxes. Let's say a tournament is paying $10,000 for 1st and $1,000 for second. The two remaining players decide to split the pot at $5,500 each, but the winner is still responsible for taxes on the $10,000. Of course, that's assuming that most FG tournaments have that sort of documentation in the first place. (To be fair, it is something that occurs more frequently, but there's a reason a lot of these tournaments are cash-based affairs to begin with).