You guessed correct. We ask each author for prior permission to rebublish. Although around 50% of the posts you see have been contributed directly by the author

You guessed correct. We ask each author for prior permission to rebublish. Although around 50% of the posts you see have been contributed directly by the authors which we then will approve before they go live on our site. We actively curated posts we feel our audience of 50,000 functional programmers will find interesting but only publish those that we have the permission to do so.