Need an answer.

[arcanefid]

At first I wanted to invite my friends to play this game and give some gold, but when I heard that someone was banned because of it, I was confused

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No way this could've happened. Nobody gets banned for helping others, except when you're helping break the rules.

Might be a bit harsh, but I'm sure 99% of people who get banned and say they didn't do anything - they're just lying. If they're really innocent I'm sure a simple message to support would fix it.

To OP: I think association with accounts is more like logging in with 2 different accounts in one device (or IP), and one of them is suspicious or banned, then the other one will be associated to it. Don't really think just giving gold/items or chatting would put your account in the 'associated' group, unless it's very large and suspicious amounts.