Replication materials for each component of the paper are provided in their respective sections.

• Descriptive: Contains code analyzing advertising patterns on misinformation websites during the 2019-2021 period.
• Consumer experiment: Contains data and analysis code for our consumer experiment. Main contains data and analysis code included in the paper and extended data. Supplementary contains additional data and analyses, including robustness checksm provided as part of Supplementary Information.
• Decision-maker experiment: Contains data and analysis code for our decision-maker experiment. Main contains data and analysis code included in the paper and extended data. Supplementary contains additional data and analyses, including robustness checksm provided as part of Supplementary Information.