> Can someone with more knowledge on the matter help explain why downloading copyrighted material using youtube-dl as opposed to a browser is treated differently under the DMCA?
It's not.
It may be treated differently under other parts of copyright law based on implied license or other theory, but the DMCA impact is on distributing, offering, etc. youtube-dl, not using it, insofar as it constitutes a circumvention tool under the DMCA.
My understanding is that it's takedown was due to fact that youtube-dl "bypasses technical measures that control access or copying of copyrighted works". I don't see how youtube-dl could be considered a "circumvention tool" if the end user of said tool would have access to the content if they used a web browser instead.
out of curiosity (and total legal ignorance)" wouldn't that logic make chrome also illegal? since it's a tool that can be used for circumvention as well. If the defense is that it's not chrome's intended purpose, then one could argue that the defense also applies to youtube-dl since its intended use isn't necessarily to download _licensed_ videos.
It's not.
It may be treated differently under other parts of copyright law based on implied license or other theory, but the DMCA impact is on distributing, offering, etc. youtube-dl, not using it, insofar as it constitutes a circumvention tool under the DMCA.