In view of the network effects characterising the platform economy, the user base of an online platform or an online search engine may quickly expand and reach the dimension of a very large online platform or a very large online search engine, with the related impact on the internal market. This may be the case in the event of exponential growth experienced in short periods of time, or by a large global presence and turnover allowing the online platform or the online search engine to fully exploit network effects and economies of scale and of scope. A high annual turnover or market capitalisation can in particular be an indication of fast scalability in terms of user reach. In those cases, the Digital Services Coordinator of establishment or the Commission should be able to request more frequent reporting from the provider of the online platform or of the online search engine on the number of active recipients of the service to be able to timely identify the moment at which that platform or that search engine should be designated as a very large online platform or very large online search engine, respectively, for the purposes of this Regulation.