That's a big claim, that every free to play game is maliciously preying on people. Here are some counterexamples: Unciv, Minetest, Shattered Pixel Dungeon. I honestly would have expected to find more love and less hate for free games on a community that is usually such a FLOSS advocate.
I'm not referring to free games, but "free-to-play" games that monetize the playerbase with loot-boxes, battlepasses, confuse-opoly and "micro"transactions. More like league of legends, Fortnite and Diablo immortal than FOSS games, like minetest.
There are several kinds of free-to-play business models. The most common is based on the freemium software model, in which users are granted access to a fully functional game but are incentivised to pay microtransactions to access additional content or more powerful in-game assets.
Oh, from what they said, it seemed like they were referring to the games themselves, rather than adverts about those games. But if they did mean the ads, then I agree, all ads are bad because they try to manipulate you to spend money - not just any specific ad or group of ads.