The council directive on unfair terms in consumer contracts puts every pre-canned contract in scope, and unfair provisions on a contract are rule non-binding (if the contract can keep existing after the unfair bits are taken out).
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A...
Right. But those are substantively unconscionable terms (“unfair provisions”), not about the agreement process itself.