When the leaks came out it was reported that French media was not allowed to publish anything about the leaks or face prosecution. https://www.theguardian.com/world/2017/may/06/french-warned-...
Translated from french newspaper: The National Commission for the Control of the Presidential Campaign (CNCCEP) on Saturday called on the media and "citizens" not to relay the contents of these internal documents. The proceeding had been seized, in the evening of Friday, by En marche !. After meeting on Saturday morning to "take stock", she stresses in a statement that "the dissemination or the re-broadcasting of such data, obtained fraudulently and in all likelihood, may have been misinterpreted, is likely To receive a criminal qualification for several reasons and to engage the responsibility of its authors ". The CNCCEP warns: "On the eve of the most important election deadline for our institutions, it calls on all actors present on websites and social networks, first and foremost the media, but also all citizens, In order not to alter the sincerity of the ballot, not to violate the prohibitions laid down by law and not to expose oneself to the commission of criminal offenses "
The law is intended to give people time to reflect and think for themselves without being influenced before they go to vote.
Starting the day before voting at zero hour, it is
forbidden to distribute bulletins, circular and other
documents
Starting the day before voting at zero hour, it is also
forbidden to broadcast electoral propaganda messages using
an electronic public communication.
[1]: https://www.legifrance.gouv.fr/affichCodeArticle.do?cidTexte... [2]: http://monde.taibaweb.com/wp-content/uploads/2017/05/arton45...
(fr link) http://www.lemonde.fr/idees/article/2017/05/17/les-macronlea...
I've also heard it was pretty bad in term of privacy with personal details of Macron supporters being published in the dump (and at least in some screenshots I've seen, there were random person address including their building access code).
This echoes what other media have reported, that nothing illegal has been found in the financing of the campaign but it shows that it got its money from banking networks and start-ups exposing the link between Macron and banks which has been denied during the campaign[1].
There are a number of other legitimate questions raised by the data found in the leak such as how Macron got access to parti socialiste's budget for the 2012 presidential campaign for example. Link this with the fact that parti socialiste pulled the rug under the feet of its own candidate while parti socialiste's current president Hollande was not a candidate and secretly suported Macron and you get a behind the scene glimpse on this french presidential election.
[1]: http://www.liberation.fr/elections-presidentielle-legislativ... and https://www.mediapart.fr/journal/international/130517/la-pis...