They actually are affected the same way tough, hosting cost, labor cost, the programs used for development, the computers used for development, all of these things cost more and more, just because some people in the industry don't act on it doesn't mean that the same thing doesn't happen...
Oh wait, what's that? They actually do act on it by selling paid DLC for extra content and people are too dumb to realize that it's exactly the same thing as increasing the price of the complete game while continuing to provide updates? Dang...
Also, look at paid subscription services, are prices staying the same forever or they're increasing? Because I'm looking at Netflix and they haven't released a new program, they've just added more content and the price is going up! Plex's lifetime price nearly doubled in 2014, they didn't release a new program, it was the same thing just getting updated.
You're just mad because the Satisfactory team is being honest about why they're increasing the price and it makes you angry because it doesn't fit your vision of how the world should work but everyone else is doing the same thing just without mentioning inflation and that's fine to you.