And they're also not allowed to decide the Earth in their game is cube-shaped.So they aren't allowed to decide what is and is not an exploit when playing their game that is hosted on their servers? That sounds bonkers to me.
A game exploit is the use of a game mechanic as unintended by their developers. If what you say is true, and it's not a game exploit, than the use of the game mechanic of mode switching and a reroll of the Bulletin Board was known by Frontier Development, and they intended the users to use it in that way.
Now they also said that this practice is against the spirit of the game, so they withdrew it.
Now think. Why would Frontier Development knowingly put a feature in the game that is against the spirit of the game, only to withdraw it because it is against the spirit of the game.
How does that make sense to you?