http://www.pcgamer.com/the-fallout-4-creation-club-goes-live-with-3-horse-armor/

Bethesda announced the Creation Club for Skyrim and Fallout 4 earlier this summer as a compromise response to the furious backlash against the paid mods scheme that Valve (very briefly) attempted to roll out in 2015. The idea is that "mods will remain a free and open system," but Creation Club content will require "credits," which must be purchased with "money," making the whole thing basically a matter of semantics: When is a paid mod not a paid mod? When it's in the Creation Club, apparently. 

None of which necessarily makes it a bad idea—in fact, we noted at the time that paid mods might actually make things better for everyone— and I don't think it's unreasonable to treat mods the same way as games: Some are free, some aren't, and you can govern yourselves accordingly. All of which is a very roundabout way of getting to the point that the Creation Club is now live, in beta at the moment but slated to go into full release sometime today, for Fallout 4, with Skyrim set to follow next month.