Hey, Brave engineer here,

In this case it is needed because there is a generic '$discard' rule in the Goggle (which means: discard any result that does not match any other instruction from the Goggle; you can see this as a 'default action' applied to results if they are not caught by any other instruction).

Using a 'boost=1' allows you to keep some sites, that you don't necessarily want to boost more than their "natural ranking".

We have a bit more info about that in the "Getting Started" guide here: https://github.com/brave/goggles-quickstart/blob/main/gettin...

I hope that helps!