Absolutely. Mint HOT and craft Dragon SBT are free. If someone offers you to buy HOT or a dragon for NEAR/USDT or other assets, it's a scam. If real money SBT transactions are detected, all participants will be banned.
* Since SBT mint has a blockchain gas fee, a real transaction may require a small amount of NEAR (usually <$0.01). This is a blockchain commission and the team has no control over it.