  Compliance with the European Union's Platform-to-Business (P2B) Regulation is
challenging for online platforms, and assessing their compliance can be
difficult for public authorities. This is partly due to the lack of automated
tools for assessing the information (e.g., software documentation) platforms
provide concerning ranking transparency. Our study tackles this issue in two
ways. First, we empirically evaluate the compliance of six major platforms
(Amazon, Bing, Booking, Google, Tripadvisor, and Yahoo), revealing substantial
differences in their documentation. Second, we introduce and test automated
compliance assessment tools based on ChatGPT and information retrieval
technology. These tools are evaluated against human judgments, showing
promising results as reliable proxies for compliance assessments. Our findings
could help enhance regulatory compliance and align with the United Nations
Sustainable Development Goal 10.3, which seeks to reduce inequality, including
business disparities, on these platforms.
