qgis - Is there no editmode for CSV files?

I load a delimited text layer and it get's visuialized. Unfortunatly I don't know why I can't switch to edit mode. I already worked with similar .CSV files in edit mode before, under the same setup :(

I already checked that files aren't write protected.
A workaround is to copy to a shapefile, but I like to work native with CSV.