Sounds like loads of confusion on your part.

@steemengineteam is not Hive Engine, and it's not PeakD.

It's more accurate to say that you decided to join some sort of vote for vote nonsense in the past and entered your keys directly into their database. They then used your voting power for their own spam. Even better, you probably never changed your keys between your Steem and Hive account, so they automatically have access to your posting authority.

Hilariously, you'd have never given a second look until @spaminator started downvoting you to catch your attention.

That's Hive in a nutshell. Too many people giving their keys away like candy and then wonder what went wrong.