For your usual game, I'd tend to say it's fair that they don't add inflation to the price as games should depreciate over time (over time, more of the game's potential audience already own it and you shouldn't expect to make money off the same old picker indefinitely... room should be made for people who create new content).
However, Factorio has been one of those games where the developers have added a significant amount of new content to their game for free (more than can be reasonably expected as I believe most game devs would charge for that kind of extra content with dlcs). So if they want to add a small price bump, I wouldn't say it is necessary as I'm sure they made a lot of money from the game, but I wouldn't say it is unjustified either given the amount of additional unpaid labor they've put into the game. They are just now deciding to monetize some of that (and not as successfully as if they had charged pre-existing owner with dlcs).
pkk234: This reasoning sucks because if/when prices and rates go back to what they werw, will anyone remember this?
There's no incentive to change prices or de-shrinkflate shit if no one calls people out on them. At least here in Japan they use that excuse, but don't ever lower prices back. We just eat it up.
Yes, short of changing currencies, inflation only goes one way.
Honestly, it's messy enough and enough people get scr*wed over when it goes up that I think it going both ways would just add to the mess and I'm sure they'd figure out a way for your regular working class bloke to get the short end of the stick either way (chaos tends to favor those with resources to capitalize on it).
But yes, overall, surges of inflation are a bad deal for regular employed people. Unless they have incredible leverage (ie, highly skilled workers), their wage is sure to lag behind and given that they are unlikely to have dedicated people focused on managing their savings full time, their savings are likely to shrink as well (as interests they earn from them are unlikely to keep up with inflation).