i definitely don't expect free stuff, but a very very VERY standard practice is to issue promotions, sales, etc. during holidays when people are in the spending mood. the company sells more, the customers get more and feel good, everyone wins. this is especially true when we are talking about pixels that cost literally nothing to produce, no cost of goods sold.
but what really pissed me off is these packs which not only does CG try to give fun, holiday themed names but they pair it with the worst packs of all time which is incredible. at a certain point you just have to laugh about it. the packs in this game are usually bad enough but they went out of their way to make it worse under the guise of jubilant/festive holiday packs!