Freedom to contract isn't a basic human right, it also wouldn't affect companies acquiring my PII from third parties - as Facebook and the like did when harvesting address books.

In most (?) countries we deny the right to contract on many things, contracts that avoid taxation, contracts that involve selling human organs, contracts that make slaves.

It avoids power imbalances from causing desperate people to do things that dehumanise, disenfranchise, and devalue them.