Exactly, the moment things cost real money in the game, the design of the game changes to increase likelihood of spending. Guild Wars 2 e.g. sells increased inventory space…and it fills your inventory with so many crap items that you’ll constantly be managing your inventory without the extra space.
At least you can improve inventory in-game (eg: do normal gameplay quest and crafting stuff to get bigger bags). Some monetization is cash or nothing.
Still bad when they make something annoying and then charge to fix it.
Guild wars 2 specifically has a surprising amount of quality of life stuff for free, but you can see places where “we can make money here” won out occasionally.