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While the game's Combat Rating stat is capped in PvP to provide an equal playing field D2R ladder items , significant Legendary Gem effects and the Resonance boosts for stats the gems give are not therefore available, so players who dress in the game's top 5-Star Legendary Gems (which again are only available by paying money) can absolutely destroy free-to-play players. 

These types of paid systems aren't exactly new for a lot of games that are free to play or mobile. Genshin Impact, for example, is one of the most played free-to-play games in the world. It's an over-the-top slot machine (aka Gacha System) where players pay real money for a chance to get rare characters as well as weapons that are superior to those free-to-play gamers have access to. 

Lost Ark, which just as Diablo Immortal is a completely free to play ARPG MMO, allows players to directly purchase the materials needed to upgrade equipment from its in-game store. The main difference between these two games and Diablo Immortal, however, is that Genshin Impact is PvE only and Lost Ark balances its PvP in order to make sure that all stats are equal for a fair highly competitive gaming environment. 

If you aren't interested in the PvP element, Diablo Immortal sadly isn't an exception when it comes to popular RPGs for free, and it doesn't offer anything that other cash-extraction mobile games hadn't done before. Microtransactions of this kind aren't the first time for in the Diablo franchise. When Diablo released the game in 2012. it came with a real money auction house, where players could sell their game-related items in exchange to earn cash. 

with Blizzard getting a small cut of each transaction. When players reached more difficult levels and the game's progress slowed there were many who felt the need to participate in the auction house to build their character Diablo 2 Resurrected buy items . Blizzard paid attention to player feedback and then removed the auction house from Diablo in full, having learnt from the experience.