Bust Up Big Tech Act This bill prohibits large online platforms in the business of offering search engines, marketplaces, or exchanges from selling, advertising, or otherwise promoting their own goods and services on their websites. The bill also prohibits such online platforms from providing online hosting services or back-end online services to any other entity that is not owned by the platform. Such platforms are those with more than $1.5 billion in global revenue during the most recent tax year and over 30 million U.S. users or 300 million worldwide users