so where's the rule about coinflipping you're talking about and how it's supposed to be used?

Scamming

Scamming is the act of stealing money, items or ZARP VIP/Booster Packs from another player through deception or trickery. It is strictly prohibited under the rules and can be punishable by our administration team. Scamming has long been an issue on ZARP, and there is a wide range of scams that range from the obvious to the in-depth and complex. Nearly all scams involve tricking the victim one way or another, although sometimes scammers will exploit the Trade System or other game features or bugs in order to steal other players items.

Gambling games are not considered scamming. If you are not willing to lose your money/items do not participate in gambling.

It is not considered a scam unless money or items are lost or received. Except in the case of agreed upon coinflips or dice rolls.

Administrators must have evidence before punishing players for scamming. If you are unsure ask a community team member to investigate the logs.