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Because that's not rarbg, rarbg is "rarbg.to", not rarbg.tw, rargb.to, rarbggo.to, rarbgproxy.to, rarbgmirror.org, rarbgaccessed.org, rarbgget.org

but what's difference between rargb.to and rarbg.to ?

rarbg.to is the real rarbg, rargb.to isn't.