Any ENS name with ZWJ will have a * in front of it.
ZWJ (zero width joiner) is a zero-width character. The width of this character is 0, which means that zero-width characters are completely invisible to the naked eye. This laying a major safety risk for ENS.
For example, when you see “vitalik.eth” and you might think its a wallet of Vitalik Buterin. However, scammer can still register “vitalik.eth” by inserting zero-width character.
DTTD is helping on this issue by adding a * in front of these names. You may realise these ENS name have a ZWJ and take caution with interacting with these persona.