A new tactic to circumvent adblockers.
A good read on the topic of adblockers potentially violating DMCA
can be found here.
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DMCA removes domain from popular adblocking list
Easylist is a popular adblocking list that is used by browser extensions to block advertisement on websites visited in the browser.
As the name suggests already, EasyList is just a list of domain names that websites are blocked from making connections to. So, instead of contacting an ad server to download an ad from it, the connection is blocked.
EasyList is hosted on GitHub, and as such all of the lists that are maintained by the project are accessible by anyone.
A recent commit to the list saw the removal of a domain from it. The reason given was "removed due to DMCA takedown request", and the line in question that was removed was ||functionalclam.com^$third-party.
The commit did not reveal more information, but a blog post on Adguard shed some light on the issue. According to the article there, the domain was added 25 days ago to Easylist.