The issue is twofold.
The first issue is that like I originally mentioned, microtransactions disproportionately affect neurodivergent individuals because of the addictive mechanics used to implement them. The concept of 'whales' is a term used to refer to big spenders in a game economy without fully examining the reason they are spending so much. For example, where you can only buy one copy of Elden Ring, you could easily buy a new copy of Forza every year and buy each car, which may be a compulsion if you have OCD, for example. The same argument could be (and should be) made against tiered subscription services in games. If there is a lootbox mechanic involved, the issue is only compounded further as it is an introduction of gambling mechanics. In some cases, it can be worth examining the presence of envy economics 'Oooh I want was they have! How much is it? Oh I want it more now I know!'.
The second issue is the scale difference is ridiculous. The amount of dev and artist time to produce a game sits at around 1.5 to 4 years and sometimes much more. There is a large number of artistic assets that are used in combination with code when making a game and those assets are paid for using the proceeds from the game sales. When micro transactions are produced, a fraction of those assets are divided out of the main game (or less often, added later) and can be produced on a 6 month cycle to be sold separately. To be explicit, the amount of assets made in a microtransaction is FAR less than those used to make the game, but often the price of the microtransaction does not reflect this (again, refer to Forza and the $200 car dlc for a minimum-$100 game). This means that either the publisher or the developer team (including art team) is receiving that margin, and if you think the developers are receiving a proportionate amount of that margin then I have some bad news for you.
To be clear, I think game monetisation is OK. But that does not mean all forms of monetisation are OK, and it definitely does not mean that diluting a product in a harmful way is OK.