About the Authors

Hideaki Ishikura

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

ishikura.hideaki@keio.jp

Affiliation Graduate School of Media and Governance, Keio University, Fujisawa, Kanagawa, Japan

Competing Interests

One of the authors served as a director of Caster Inc. from October 2016 to November 2023 but has since resigned. The authors have a data use agreement with Caster Inc. to conduct academic research. This does not alter our adherence to PLOS ONE policies on sharing data and materials. The authors declare no other competing interests related to employment, consultancy, patents, or products in development.