The party finder is completely full of spam for dungeon carries- those are supposedly sold for ingame currency, gil. However, these amounts of gil are nearly impossible to obtain legitimately for new players, and if the players have that much gil they typically would use it on other things.

A large portion of these carry runs are purchased with gil obtained through RMT, and then the players who do these runs turn around and sell the gil they obtained for real money through RMT.

I have played many MMOs in the past, FF14 is by far the closest to perfection amongst all of them. Every single MMO where carry runs weren't restricted resulted in serious degradation of the game's integrity. On Maplestory 2 for example, rampant carry runs organised by people who were sponsored to play the game on twitch caused insane amounts of RMT gil to move, and augmented the botting problem to insane proportions.

At the very least, make sure sponsored content creators do not partake in carry runs. Luckily I'm not aware of any content creators pushing carry runs, but its very important that it never happens in the future either.