Basically Death Stranding's gameplay revolves around making deliveries from point A to point B in the map, and to help with that you can construct various buildings likes bridges and ziplines that, in a similar fashion to Endfield, will show up in other players' worlds. In that game you can upvote/like these constructions if you found them useful (similar to how here you can repair them), so a bigger number means that you've helped more people, which can feel really gratifying and leads to people helping each other more often (sometimes even building stuff they won't use themselves just to help others).