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Go to the Adguard GitHub (or use the extension) and report it. And get all your friends to switch to Adguard extension and Adguard Home (Pi Hole alternative) as blockers.

Easylist and its sublist are notorious for being poorly maintained and ignoring issues opened against it. Adguard is much more active in maintaining its lists. Especially Adguard its language blocklists have much, much less breakage and missed ads than Easylist.

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>> And get all your friends to switch to Adguard extension and Adguard Home (Pi Hole alternative) as blockers.

Nice of you to slip this "easy" step into your advice. Give me a break!

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Perhaps it got hacked and was hosting malware without you being aware? They are pretty good at hiding it from the site owner (showing the original website to you, but not to others).
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The server is and has been clean the whole time. I don't even run WordPress or anything similar on that server that would be a common hacking target. If it was hacked, I'm pretty sure Google Safe Browsing would be the first to flag the site, not some random PiHole list.
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