Hi,
Newspapers are not frequent on wikisources (see https://fr.wikisource.org/wiki/Cat%C3%A9gorie:Journaux for the french wikisource) but absolutely not forbidden.
Here a difficult example with a lot a text/column by page on the french wikisource : https://fr.wikisource.org/wiki/Livre:L%E2%80%99Ouest-%C3%89clair_n%C2%B0_539...
Cdlt, ~nicolas