The document discusses abuses of dominance in digital markets. It notes that while some digital platforms like Google and Facebook offer free services funded by advertising, others like Amazon intermediate between sides and take commissions. Traditional antitrust theories of harm around tying and exclusivity have been applied to digital markets. New theories include platforms acting as both marketplaces and retailers leading to self-preferencing, and cases involving data access and use. Authorities need to rely on sound theories of harm tailored to specific conduct and incentives, while the application of exploitative theories to data remains uncertain legal territory.