This is a pretty cool idea for a portable user definable filter. I hope this catches on in other clients so that we can get rid of all these client specific ways of doing so filtering. I'm guessing it shouldn't be difficult to add npubs to a list in there, and for clients who already have inbuilt blocklist functionality to read from and write to it so that for casual users the experience doesn't change but for advanced users they can modify the file. Cool work man.