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That isn't how YouTube's Content ID system works.

The vast majority of users don't have access to the system.

When a claim is filed against a video, it is assumed accurate until the appeal process is approved, and revenue is lost immediately.

Source: Ex YouTuber, 15m video views

Copyright protection subsists, in accordance with this title, in original works of authorship fixed in any tangible medium of expression, now known or later developed, from which they can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device.

17 USC 102(a)

https://www.law.cornell.edu/uscode/text/17/102

This post itself is copyrighted under the terms of US law, as well as similar language under common international 'Berne Convention" laws. As is yours. At the moment of creation, with no further action or registration required. For a duration of 95 years, as an anonymous work (17 USC 32(c)) -- or to 70 years after my death, if not anonymous.

A fact which I personally find to be grotesque and insane, but which is indisputably law.

copyright is automatic; the creator need do nothing.