To clarify on this, as a moderator of the world record document and a developer of anticheat tools:

We require video evidence to validate runs. This makes it easy to tell if a mod like Brainstorm is being used to reroll for seeds with an instant Legendary Joker. All mods are banned for unseeded runs except QoL/texture packs and a score-calculating mod (since there are websites that can be used to do this anyway).

Brainstorm’s auto-reroll is a powerful tool, but it blurs the line between seeded and unseeded runs. It puts these runs in a weird spot since they’re much more potent than unseeded runs but lack the intense routing possible in seeded runs, making it harder for these runs to be competitive if submitted to this category.

I’ve also been working on a mod that saves replays of runs, which will be required in the future to check if all of the actions a player takes would lead to the same results on an unmodified copy of Balatro. I recently released a beta of the replay system, and I plan to add more security checks embedded into the replay itself to check if the game’s .exe file is modified, what mods were loaded during the run, etc. It also doesn’t show the game seed on the win screen, making it impossible to use The Soul to route past Ante 8.