lupineshadow: Oh that's easy.
It was GOG's fuckup.
Bethesda wouldn't have changed their policy so soon.
GOG wouldn't have been able to change it back without Bethesda's say-so.
So GOG overstepped the mark (c.f: Steam did the right thing by ensuring existing customers had access to what they paid for).
GOG could restore access to paid content and look like the saviour - except they didn't need to remove it in the first place.
Well done GOG ineptitude.
While I agree it should never have been done, and that GOG likely made a mistake, perhaps trusting in Bethesda and not looking too closely at the details, in reality it was Bethesda who made the change and left out the extra mission packs. GOG should have just been able to do a straight swap over, and trust all was fine. GOG no doubt are busy and have better things to do than second guess Bethesda or check up after them.
So I would hardly class GOG as being inept, certainly in this instance, if not in others.
If they were truly inept in this circumstance, then they would never have accepted they needed to restore things. They eventually did the right thing and that should be praised.