I see some eBTC and iBTC coins that include scam coins. But I once had a coin of airdrop and the coin has a high price especially for eBTC which turned into a very expensive coin. I am confused for that

yes I also once had the same coin. Maybe even if the coin is a scam or not it will not be a problem for us who just became a person who sells coins. But it will be a serious problem for those who buy coins. If the coins were really scam then that would be a big deal for them.