The United States Senate had earlier commissioned an investigation into claims that the "Big Four" tech companies - Amazon, Apple, Facebook and Google - exert monopolies on the main sectors in which they operate, and, furthermore, maintain them through systems that act in their favor. This process has resulted in findings that could be interpreted to uphold these complaints.
https://www.notebookcheck.net/A-US-Senate-Subcommittee-report-concludes-that-Google-Apple-Facebook-and-Amazon-abuse-their-positions-in-their-markets.497365.0.html