Project scope defines the project’s:

Project scope in Ahrefs defines the boundaries and limitations of your project's crawl. This includes specifying which URLs to crawl or exclude, setting depth limits, and configuring other parameters that control how Ahrefs collects data for your project. By defining the crawl limitations, you ensure that Ahrefs focuses its resources on the most relevant parts of your website or target sites. Crawl speed is a setting that affects how quickly Ahrefs crawls, but it's a technical configuration, not a definition of the project's overall scope. Organic competitors and tracked keywords are elements you might analyze within a project, but they are not what the project scope defines; rather, they are data points gathered or monitored within the defined scope.