Steam Workshop might be convenient, for you.
It's not for GOG users.
Repacking a mod is as simple as making it into an archive.
Also those that detest the very basic nature of the Workshop, and it's forced auto updates constantly breaking carefully created mod setups, for many games Which makes the entire system a pain in the arse, best avoided.
Simple fact is, all the Workshop does is download a specific set of files to one folder. A separate Mod Management system is needed, to use them correctly, and if the mods don't use that one folder, they won't work with Workshop.
Often those files are restricted to certain prepacked files.
ESP, and BSA for Skyrim, and is DOS EE just PAK files?
Can't check myself, as the Workshop's currently broken.
Nexus is a dedicated Host, and uploading a mod there takes a small effort, making a description. The Workshop/ReadMe info can be copied. Or a very fancy one created.
Regardless, there's plenty of file hosts, like Mega.nz that can be used with just an upload.
I'm capable of converting any Workshop mod to a normal mod for any game, and I'm pretty certain I don't need that game on Steam, to do that, but I can't confirm that whilst it's down.
Many mod users, aren't as skilled as me, and need the mod repackaged for them.
I would urgre you all to consider those not wanting, or not able to use the Workshop. Please upload an archive version somewhere else, and NexusMods is the most user friendly option.
