<p>Privacy regulation in digital markets increasingly relies on consent mechanisms implemented through user interfaces. While legal rules define the conditions under which consent must be obtained, interface design determines how easy it is to refuse data collection. This paper conceptualises consent interfaces as behavioural implementations of regulation and focuses on two measurable features of consent design: rejection friction and visual salience asymmetry. Using structured data on 8,000 domains from the Tranco ranking, analysed through the Consent Observatory tool, this paper examines consent interfaces across Poland, France, the Netherlands, and an additional global benchmark. The main comparison focuses on the three European country samples. The results show systematic differences in how refusal is structured. Direct rejection is much less common in Poland than in France and the Netherlands, and refusal in the Polish sample more often requires an additional step. Visual asymmetry is high in all three European country samples and strongest in Poland. The findings indicate that formally similar consent requirements can create systematically different choice conditions for users. From a regulatory perspective, this suggests that the implicit cost of refusing data collection depends not only on the formal existence of options, but also on how refusal is structured and presented, including through the intermediary systems that shape consent interfaces.</p>