Came across it recently, like a week ago, while looking whether my phone has any custom ROMs. Cool but worth noting it's quite in legal gray area. Pixel is trademarked by Google & bundling GApps requires* MADA license from Google & takes* actions to bypass Play Integrity.

*It's why more known custom ROMs (LaOS & crDroid) are distributed without GApps.

**Something certainly great for its users but creates risk for a backlash against custom OSes.