Article 3 sets the designation criteria. An undertaking is designated as a gatekeeper if it (a) has a significant impact on the internal market (EUR 7.5 billion annual Union turnover OR EUR 75 billion average market cap in each of the last three financial years), (b) provides a CPS that is an important gateway for business users to reach end users (at least 45 million monthly active end users + 10,000 yearly active business users in the Union in the last financial year), and (c) enjoys an entrenched and durable position in its operations (at least three consecutive financial years of meeting both thresholds; or substantiated likelihood of meeting them in the near future). Designation is presumed where thresholds are met; the undertaking can rebut. Article 3(8) sets the 45-business-day timeline for designation following notification by the undertaking.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.