I don’t know; he doesn’t mention it in the video.

I had the same thought as you; I was curious because I also wondered what the scam is and if it was a new DDoS tool with just an unprofessional website. I expect that 99.9% to 100% of users use it for free so wander what the purpose is. I watched this video: https://www.youtube.com/watch?v=CosPILI0qrw and in the video, he makes a website https://bliptext.com/ and the website triggers uses this ddos tool.

If there is one that is smaller than 950MB, it would be interesting if you uploaded it to a cloud sandbox analyzer like Any.Run, Triage, or some other similar service.