I know in France it's illegal to encrypt data so if I run a tor relay in a French server I would have any problem?

Crypto is not illegal since 1999 in France. Do you have any source about what you advance ? There is the new surveillance bill/law, but not currently applicable (need formal application details before that) and even this law doesn’t forbid crypto. Regards, -- Aeris, french citizen Groupe crypto-terroriste individuel autoradicalisé sur Internet Protégez votre vie privée, chiffrez vos communications GPG : EFB74277 ECE4E222 OTR : 5769616D 2D3DAC72 https://café-vie-privée.fr/