Well when you think about it, it makes perfect sense. It occurred to me yesterday.
It's a marketing strategy, they're doing it to try and bring the HOI4 game to more people. Of course the people here on this forum already have it, so we aren't the target for such a marketing campaign. For us, they want to sell us any DLCs we haven't bought yet, so any future campaign would be arranged around that.
If they'd have said that openly and honestly, instead of the 'because more people' thing, I'm sure most people would have reacted positively and understood the reasoning.