CoinMarketCap says it has found no evidence of a data beach despite the circulation of a list of 3.1 million email addresses that correlates with accounts on its service. The data is only email addresses and does not contain password hashes or other information. The list had been posted as far back as August on a well-known data breach forum. The company thinks the list was compiled from other data breaches. Having an accurate, long list of people who are interested in cryptocurrency is very useful for attackers for phishing attempts.”]
Source: https://www.cuinfosecurity.com/coinmarketcap-no-breach-despite-31m-email-address-leak-a-17789