It´s not really that serious, it´s just some symbols or numbers hidden somewhere on the card that, when decoded by the author, become your patreon username, so they can ban you from their patreon list without accidentally kicking a innocent one.
It´s just that when they find you, they will also inform other authors, and they will also ban your account, and that sucks.
The only one who is truly mentally ill and dangerous is Earthship. Because he knows that if you are stupid enough to buy a single card for 200 USD, he knows you will be easily manipulated into giving him more dangerous information and details about yourself.
Most of the stuff that was leaked from Earthship came from when his card were still in the Patreon shop priced at 20-30 USD. Here:
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Also Earthship links go down really fast because he reports them for CP and terrorism, but if he keeps reporting like that, the feds will actually think he is actively looking for this stuff and will check his computer. I think he lives in Hong Kong, the police force there is strong, I hope he is ready for a visit from them someday. People think they´re genius for using VPNs, but VPNs can´t be a shield when you do stupid stuff like that.