I wanted to address this, because I understand where you come from. Threes is actually credited in the about page[1] on play2048.co.

The frustration is completely understandable, as Threes is definitely where the concept originated. Due to the chain of derivative games that led to the creation of 2048, I had not seen or heard of Threes until after it went viral. I think the inspiration Threes provided, although valid, is somewhat indirect in the case of 2048. I did try my best to reflect this in the about page and when I talked about my experience here[2].

I noticed there's no mention of it on GitHub, so I'll add it there. I am happy to do better given the feedback, but I'm not sure what kind of improvement I could make here. Let me know

[1]: https://play2048.co/about

[2]: https://medium.com/@gabrielecirulli/2048-success-and-me-7dc6...