Testnet user wasnt a selection it was open for everyone, the blockchain got often reset, except the last test period to verify all running smooth and stable, the mined 60000 coins arent reset as bonus for eyeryone who contributed work during testphase or joined this early.

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You got not banned for trying to sell, you got temporaly banned for insulting people, you got banned for not accepting this and join afterwards with severall alts and start this all over.

The "labelling as scammer" was an aware message caused by several people messaged the dev you do scamming