Some markets are effectively "whoever spends the most mana wins everybody else's mana". This leads to a potentially very destructive dynamic where people are incentivized to continue buying mana with real money in an attempt to outspend everyone else, with a massive payoff if they succeed. These markets reward brinksmanship where whoever is most willing to risk damaging their real life financial situation will win, and can lead people who get emotionally invested in winning to lose huge amounts of real money.

Presumably Manifold does not want a reputation as a site where people gamble away their life savings, and they could attempt to address this by banning or implimenting a spending cap on these sorts of markets.

This market resolves based on whether such restrictions are ever implimented and consistently enforced. Not whether they were announced for the future or whether they still exist at the end of 2023.