I think you can qualify a hater as someone who wishes someone else would fail for no good reason other than making them feel better about themselves. Maybe that’s envy, maybe it’s not.
Moreover even when there is "no good reason" initially, good reason might be found eventually. Scrutiny usually begins with the intuition that something doesn't add up, with the actual evidence arriving later. The "hate" for the fraudster precedes the exposure of the fraud.