The Sony PlayStation 5 outputs all content in HDR by default, even if games or videos do not support a higher dynamic range. There are some situations where one may want to disable HDR though, but it turns out that Sony's latest console struggles with displaying the correct colours when set to SDR.
https://www.notebookcheck.net/The-Sony-PlayStation-5-is-unable-to-display-SDR-content-correctly.530132.0.html