Regarding pre-market trading, many platforms are not trustworthy. For example, some platforms have opened pre-market trading for BIO, but they do not have coins. They trade points. You cannot buy and then wait for the official opening. You must sell or buy real coins before the delivery date to complete the delivery. This becomes a race to see who runs faster at the last minute, and usually the platform harvests them. Therefore, the reputation of the first few pre-market transactions was very bad, but newcomers were unaware and continued to do so.