It makes more sense if you consider that accounts relating more directly to cryptocurrencies and ICOs are juicier targets for spear-phishers, which makes Mailch

It makes more sense if you consider that accounts relating more directly to cryptocurrencies and ICOs are juicier targets for spear-phishers, which makes Mailchimp a target for social engineering and direct intrusion. If there is an account that announces a sale on semigloss paint at Brick'N'Mortar's this Saturday, that's not much for Mr. Blackhat to work with. If there's an account that announces that phase 2 of their ICO is going live this Saturday, Mr. Blackhat might want to hack in and send out an "update" just as that is happening, to trick people into sending Bitcoin into his own account, while also preventing legit e-mails from going out. It's not just that ICOs and cryptocurrency mailings are more likely to be spam. Information-based money transfer systems allow manipulation of information to be more easily monetized, which puts an information-dissemination hub at greater risk.