when someone send you an invite in dota, you have two options below that you can tick: block all invites, and block communications, afair. 1st one should help, altho im not 100% sure, since i never tried it myself.
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Change name to something random in korean, and put anime picture, or a normal picture in your case.
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how can i make sure they cant see me in game and cant message me without going offline or deleting?
any options?