Four categories of systemic risks should be assessed in-depth by the providers of very large online platforms and of very large online search engines. A first category concerns the risks associated with the dissemination of illegal content, such as the dissemination of child sexual abuse material or illegal hate speech or other types of misuse of their services for criminal offences, and the conduct of illegal activities, such as the sale of products or services prohibited by Union or national law, including dangerous or counterfeit products, or illegally-traded animals. For example, such dissemination or activities may constitute a significant systemic risk where access to illegal content may spread rapidly and widely through accounts with a particularly wide reach or other means of amplification. Providers of very large online platforms and of very large online search engines should assess the risk of dissemination of illegal content irrespective of whether or not the information is also incompatible with their terms and conditions. This assessment is without prejudice to the personal responsibility of the recipient of the service of very large online platforms or of the owners of websites indexed by very large online search engines for possible illegality of their activity under the applicable law.