I'm as cynical as the next person but this appears to over ads that have a malware payload when clicked (maybe when even not clicked, is this possible??) -- not copyright infringement.

Anyways this site: https://torrentfreak.com/chrome-blocks-major-torrent-sites-o... says that the issue is already resolved so we don't need to run around screaming that the sky is falling and pointing fingers :) See the very end of the post.

Update: Some people report that Firefox also started blocking access to several torrent sites.

Update: ExtraTorrent says it successfully resolved the issue with Google through webmaster tools. RARBG is also unblocked.

Update: Google didn’t comment on this specific situation and referred us to a recent blog post.

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link provided by superasn: https://news.ycombinator.com/item?id=9869360

Who says this is about copyright infringement?

Given that this is a torrent site, I think that malfeasance is a natural, and good, first assumption.

Attributing things to ignorance over malice is only going to result in evil people getting away with it.