first of all, Marketplace is handled by Microsoft and not Asobo.
And like every big company in the world, Microsoft is of course staffed 24/7.
Probably not the team that takes care of the Marketplace, but still there will be enough ppl at work during holidays.
And actual holidyas are just 3 days and overlapping with a weekend.
So for anything critival, there will be someone left to take care of it.
Just general work is slowed down and we will probably not hear or see much from them.
But of course it is also important to them, that we have the update so when we are all home during holiday season, can enjjoy the sim and dont have to wait 2 more weeks for any fix that will then be ready just when it is time to go back to work…