I personally dislike the idea of (further) fragmenting things like job boards (or real estate listings, or travel fares, etc.) where breadth is critical. How is this better than a general-purpose job board with an option to filter by remote-friendliness? Unless people are willing to potentially miss out on listings that don't happen to be on this particular board, this is just one more addition to a long list of places the user has to keep track of if they are job-hunting.