I did not create it. I just posted it here after someone else here told me about it the other day. I saw it was FOSS from the message at the bottom of the page on https://www.lastpaywins.com/. I did spend too much time on this website today though, having noticed this detail.

The dev @alex_lewin is at the top of the comments here.

south_korea_ln

bitcoin

Last Pay Wins

Well of course it looks FOSS to you, you created it and know the link lol. I couldnt see anything on the website (but I only scanned). 

I see it won at a hackathon. Congrats