Twitter has a new feature where users can pay twitter money to offically endorse them as someone who has paid money to record their name in a ledger next to a link or identifier for an image (i.e. an NFT). These users are highlighted in the twitter feed with a hexagonal outline around their profile picture.
You know what I call paying money to a service in order to highlight or distinguish certain content? An advertisement. This is a custom uBlock filter that will treat posts with the special outline as ads and hide them.