In Grav, an Uplink allows one to set a spawn point for the current world.
Like other buildings, an Uplink can be upgraded, but it's not clear what happens when an Uplink is upgraded or how it affects respawning. The only things I can guess it might do is either reduce the cost of respawning or reduce the cost of binding to the Uplink, but I haven't confirmed either yet.
What effect does upgrading an Uplink have?