This site is protesting against parts of the planned EU copyright reform, which may soon be adopted by the European Parliament.
The proposed reform could severely restrict the free Internet. Even the smallest companies could be driven to use error-prone and technically immature upload filters for all their content (Article 13) and acquire licenses for minimal text excerpts from press products (for example the previews when you post a link) to comply with the so-called ancillary copyright for press publishers (Article 11). This could significantly affect the freedom of opinion, art and the press.
Furthermore, thanks to Article 12, the current version of the reform harms the creators.