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The text "please..." doesn't fit with friendly usability; the user shouldn't have to ask anyone.

Do you understand the difference between a user and a consumer, especially when we're talking about a "Russian-speaking" audience? A consumer definitely shouldn't have to ask for anything. A consumer is someone who pays money (or someone pays money for them, but the key here is "pays").
With conditionally free products, the user agreement usually includes clauses stating that the publisher has no obligations whatsoever to the user. By requesting something for free, each individual is essentially asking: "Please give me your free product; I agree to all your terms." Even if the button says "Avada Kedavra," "You rejected me twice, I don't want to - you said," or "DUDEEEEEEE," it doesn't change that.