Platforms drive the 21st century with orchestrating gatekeepers dominating the digital economy. Simultaneously, IT policymakers are increasingly concerned with antitrust regulation in the digital realm, abuse of market power, and monopolization cases against the most prominent digital platforms. This paper contributes to this ongoing debate by presenting the Platform Power Abuse Taxonomy. We provide an overview of abusive behaviors, considering the market position of platform orchestrators and differentiating platform types and affected market participants. Adopting a cross-platform approach, we rigorously analyze orchestrators' abuse vehicles and abuse tools to exploit their dominant position by incorporating findings from literature and real-world contexts.