[1] For YouTube to retain DMCA safe harbor protection, it must respond to copyright infringement claims with a notice and take down process.
[5] 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.
[6] Fair use is a legal rationale for reusing copyrighted content in a limited way, such as to discuss or criticize other media.
[7] YouTube creators have reported receiving copyright strikes on videos critical of corporate products.
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.