It's not a reskin , I developed it on my own. It's just that these workflow builders are built using libraries such as React Flows. As you can see in the bottom right of the sheet of the flow builder. Also my application is built on Svelte, and I'm using Svelte Flow which is a fork of React Flow itself.

IMHO, if someone made something while following along with a tutorial, I do think they should be free to turn THAT software they made (with a guide) into a product. The presumption being that the tutorial isn't just handing you a product that you sell with no changes. (I do see there's access to the source code in the description.)

Skimming the video, and this site, I'm not noticing a ton of differences other than some minor styling changes. Maybe the author could mention any of the changes they've made? If they're significant, IMO, it's fine.

Yikes. I was wondering where all of these exact replicas were coming from. Thanks for sharing.