Maybe, but you not partaking in the microtransactions doesn't mean you don't get "buy this!" or "don't miss the sale!" advertisements within the game teasing and taunting you to spend money.
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That's not how it works.
I cannot claim WoW is a game "without any cash shop" if I choose not to buy anything from the cash shop. PvP is still there, regardless if I partake in it or not. Same thing with Diablo: Immortal: the microtransactions are still there. The boosts are still there. The exclusive stuff is there.