I think you're right to do this against wowmatrix, and if I was a curse nor wowi admin I would filter out wowmatrix HTTP request the way this unwanted updater can no more access both best addon sites, this is bandwith abuse.
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If you need to reach me I'm in ESO, @class101 or "Fathis Ules i"
addons: SpamBayes, BrokerCPU
projects: ThunderBayes
Mera[xeh]? - La CroisadeEcarlate (wow)