According to official announcement from Binance, they will add observation tags for more tokens as from beginning of this month (January). These token (ACA, D, DATA, & FLOW) and other tokens will be closely monitored to avoid higher volatility and risks.

It was also explained in their ‘Directive Memo’ that the trading the listed token observable tag label caries risks because this token no longer meet the standard listed on the Binance platform and in the future they may be delisted.

Acala token (ACA), DAR Open Network (D), Streamr (DATA) and flow (FLOW) are the recognized token does not meet the current standard of trading.