They sent a very good young PG and a rebounding beast of a center to The Knicks for Porzingis. Porzingis has an ACL injury that should not affect him long term, but might limit him much of this season. So let's assume they tank, keep their top 6 protected draft pick which would otherwise go to The Hawks. That would leave them with a healthy Porzingis, Doncic, a top 6 rookie and a pretty good support roster next season, which would likely stick Atlanta with a mid to late 1st rd player in next year's draft instead of the lottery pick this season.
We just got stiffed in my opinion.