I have one of these I ended up never using because I didn't realize my power supply wouldn't handle it. By the time I decided to build a whole new PC, I ended up having enough saved up to get an RTX 3080. Video cards were super hard to find at the time so I decided to hold on to the 1080 in case of emergency. Do graphics cards matter much in something like a dedicated Minecraft or 7 Days to Die server? If so, I might build one with it.
Sorry to say, it will do nothing at all for you in a server setup. You could run any game server without a graphics card at all and it would make no difference. Game servers would be better served by a good processor and lots of RAM.
The only thing a graphics card could do for you in a server is if you host a media library (e.g. Plex or Jellyfin) and then need to transcode video for a device that can't natively play it (e.g. TV can't natively overlay subtitles, so the server has to burn them into the video that streams to the TV). Another instance could be running image processing on a security camera feed for example.
The 1080 is a spectacular card, one of the best valued cards Nvidia ever released. I have been using mine basically non stop since launch and it's still going strong.