"...big platforms relating to tracking are too big or complex to regulate..."
Yup--that should be refuted. Legitimizing any such claim would be permission to deliberately build systems that lack the necessary capabilities--including those for law enforcement." We must require that tracking systems have the capabilities to be audited for any manner of tyranny!
And, any tracking data that is not attributable to specific individuals will have to be provably so--also subject to audit--as statistical databases are known to be problematic with regard to these things.