Content ID was not at all alien to the 90s Congress; the DMCA explicitly calls for the industry to develop such systems, though it stops short of requiring YouTube to do all the technical heavy lifting:
(1) Accommodation of technology.—The limitations on liability established by this section shall apply to a service provider only if the service provider—
(A) has adopted and reasonably implemented, and informs subscribers and account holders of the service provider’s system or network of, a policy that provides for the termination in appropriate circumstances of subscribers and account holders of the service provider’s system or network who are repeat infringers; and
(B) accommodates and does not interfere with standard technical measures.
(2) Definition.—As used in this subsection, the term “standard technical measures” means technical measures that are used by copyright owners to identify or protect copyrighted works and—
(A) have been developed pursuant to a broad consensus of copyright owners and service providers in an open, fair, voluntary, multi-industry standards process;
(B) are available to any person on reasonable and nondiscriminatory terms; and
(C) do not impose substantial costs on service providers or substantial burdens on their systems or networks.