A think this tool is a good complement for the great work done by @redapg....... Workshop Item List To download the content on a dedicated server. https://github.com/VovoloGames/WorkshopDL
Sorry to say... that probably won't last long. Every tool has been taken down previously because it was against Steam TOS. This is how a previous tool went tits up: https://www.reddit.com/r/swd_io/comments/uy55qg/we_are_no_longer_serving_any_files_through_our/
This is not a web, this is an aplication and the source code is there. Everyone can change the code and continue developing this. The aplication uses SteamCMD and this is allowed by Steam. The only way to avoid this would be that Steam removes SteamCMD.