If you are using an in-browser Ethereum wallet (e.g. Metamask, Brave, Parity) then any website can detect if you are an Ethereum user. I wouldn't be surprised if some advertisers are already collecting this information.
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If you are using an in-browser Ethereum wallet (e.g. Metamask, Brave, Parity) then any website can detect if you are an Ethereum user. I wouldn't be surprised if some advertisers are already collecting this information.