To safeguard a fair commercial environment and protect the contestability of the digital sector it is important to safeguard the right of business users and end users, including whistleblowers, to raise concerns about unfair practices by gatekeepers raising any issue of non-compliance with the relevant Union or national law with any relevant administrative or other public authorities, including national courts. For example, it is possible that business users or end users will want to complain about different types of unfair practices, such as discriminatory access conditions, unjustified closing of business user accounts or unclear grounds for product de-listings. Any practice that would in any way inhibit or hinder those users in raising their concerns or in seeking available redress, for instance by means of confidentiality clauses in agreements or other written terms, should therefore be prohibited. This prohibition should be without prejudice to the right of business users and gatekeepers to lay down in their agreements the terms of use including the use of lawful complaints-handling mechanisms, including any use of alternative dispute resolution mechanisms or of the jurisdiction of specific courts in compliance with respective Union and national law. This should also be without prejudice to the role gatekeepers play in the fight against illegal content online.