It&#x27;s far more likely that he was overly optimistic about Mailbox&#x27;s chances of success at Dropbox. Founders are notoriously delusional about this kind of thing.<p>Dropbox wasn&#x27;t worried about maintaining the small existing Mailbox userbase, they were betting they could grow it by millions of users. When it didn&#x27;t work, it messed up their plans (and promises).<p><i>Never attribute to malice that which is adequately explained by stupidity.</i>