YouTube copyright strike
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YouTube copyright strike is a copyright policing practice used by YouTube for the purpose of managing copyright infringement and complying with the Digital Millennium Copyright Act. The Digital Millennium Copyright Act (DMCA) is the basis for the design of the YouTube copyright strike system. For YouTube to retain DMCA safe harbor protection, it must respond to copyright infringement claims with a notice and take down process. YouTube's own practice is to issue a "YouTube copyright strike" on the user accused of copyright infringement. When a YouTube user gets hit with a copyright strike, they will be required to watch a warning video about the rules of copyright and take trivia questions about the danger of copyright. A copyright strike will expire after 90 days. However, if a YouTube user accumulates three copyright strikes within those 90 days, YouTube terminates that user's YouTube channel, including any associated channels that the user have, removes all of their videos from that user's YouTube channel, and prohibits that user from creating another YouTube channel.
YouTube assigns strikes based on reports of copyright violations from bots.
Some users have expressed concern that the strike process is unfair to users. The complaint is that the system assumes the guilt of YouTube users and takes the side of copyright holders even when no infringement has occurred.
Reasons for strikes
Disagreements about what constitutes fair use
Fair use is a legal rationale for reusing copyrighted content in a limited way, such as to discuss or criticize other media. Various YouTube creators have reported receiving copyright strikes for using media in the context of fair use.
Suppression of criticism
YouTube creators have reported receiving copyright strikes on videos critical of corporate products. They assert that copyright violation, in this context, has been used as a strategy to suppress criticism.
Strikes for posting own work
Copyright strikes have also been issued against creators themselves. Miracle of Sound's channel was hit with multiple copyright strikes as a result of automated strikes by the distributor of their own music.
Strikes for works in the public domain
In a similar incident to such strikes, though in another forum, Sony issued an automated copyright strike against James Rhodes for a video on Facebook of him playing part of a piece by Bach, on the grounds that they owned the copyright on a similar recording, and when the strike was challenged, asserted that they owned the rights to the work, before finally admitting that Bach's compositions are in the public domain. 
Strikes for unknown reasons
Some publishers on YouTube report not understanding why they have received strikes.
This may relate to the fact that 99.95 percent of DMCA takedown notices are actually sent at random URLs that could have existed (valid format) but are not actually used at all at the time the takedown notice is sent. This is the work of bots having no valid claims to any copyright, trying to carpet bomb DMCA notices for various illegal reasons such as trying to ruin a competitor. 
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- Eordogh, Fruzsina (1 September 2018). "TikTok's Owners Falsely Copyright Strike Criticism Of App". Forbes.
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- Techdirt article on bogus DMCA takedown on invalid URLs being the bulk | https://www.techdirt.com/articles/20170223/06160336772/google-report-9995-percent-dmca-takedown-notices-are-bot-generated-bullshit-buckshot.shtml