You stupid boy?
they stopped doing that
if you read the message steam put out, it's more along the lines of "we've always wanted to do this, but the already large community of skyrim wasn't the best place to implement it"
EDIT #1:
http://steamcommunity.com/games/SteamWorkshop/announcements/detail/208632365253244218"We understand our own game's communities pretty well, but stepping into an established, years old modding community in Skyrim was probably not the right place to start iterating."
the fact that bethesda was ok with this and that it came out while fo4 was everything but confirmed does not bode well.
EDIT #2: plus, bethesda (or, rather, the investors of Zenimax Media) is still going to try to make some money off of this. whether it's paid licensing for the GECK/Creation Kit or for straight up paywalled mods.