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In page 2010s:

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The later half of the decade saw the explosive growth of free-to-play battle royale games such as Epic Games' Fortnite Battle Royale and Respawn Entertainment's Apex Legends.[20] This model, dubbed "freemium", uses in-game microtransactions and loot boxes to generate revenue. These microtransactions have garnered ethical concerns; the intrusive nature of in-game microtransactions can lead to children accidentally or purposefully rack up a high bill from purchasing in-game items,[21] while the compulsion loop caused by loot boxes has drawn comparisons to gambling addiction.[22]