Default Unwrite Host File?

So back in the glory days of my stock, rooted MDL, I used an ad block program that wrote a host file. To my surprise and interest, upon unrooting and triangle away and factory resetting, then OTAs to MJA...the file still lives. It's actually breaking my YouTube with connection to server lost errors. Those are related to ad block plus. Is there any way to unwrite this host file? Without rooting?

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