They never reselled it, I have no proof of that but I'm pretty sure of it, in fact the use of this software stopped in 2016 when the french state site mon.service-public.fr stopped (see https://fr.wikipedia.org/wiki/Mon.service-public.fr), software was used from 2009 to 2016, by a french administration named DGME, so 7 years. Orange extended its own identity provider (used in their old ISP trademark "Wanadoo") which was some kind of proprietary SSO protocol a bit like CAS, and extended it with Lasso to deliver a real SAML identity provider for this project to French state); they never have any incentive to use it for themselves and they do not resell softwares anyway.
The background of all that is only supposition from me (we participated to the same project as the contractor of another administration, la Caisse des dépôts et Consignation, but we were never inside the project of delivering Mon.Service-public.fr itself which was the project won by Orange Business Services and using Lasso), but I think it happened because an engineer was expected to deliver the software but its managers never asked him how he would do it, and at some point someone waved the problem of the license away because everything was too late anyway. It's just my own big corporation fiction, your mileage may vary.
The background of all that is only supposition from me (we participated to the same project as the contractor of another administration, la Caisse des dépôts et Consignation, but we were never inside the project of delivering Mon.Service-public.fr itself which was the project won by Orange Business Services and using Lasso), but I think it happened because an engineer was expected to deliver the software but its managers never asked him how he would do it, and at some point someone waved the problem of the license away because everything was too late anyway. It's just my own big corporation fiction, your mileage may vary.