The analysis focused on identifying "killer acquisitions" by examining the technology similarity index between firms before and after M&As conducted by GAFAM. Killer acquisitions were defined as those with minimal change in the technology similarity index pre- and post-transaction. The study found that killer acquisitions negatively impact innovation, as measured by a significant decline in the number of patent applications from acquired companies, compared to non-killer acquisitions where patent applications tended to increase post-acquisition. These findings highlight the need for methodologies, such as the technological similarity index, to better identify and regulate such anti-competitive acquisitions in the digital platform sector.