Counterpoints: Deezer, Doctolib, Back Market, Tidal, Adopte, Mistral, Dassault Systemes (the company behind the two main CAD softwares out there), Thales, Qonto, Kyutai, Mirakl, BeReal, Klaxoon, ABTasty, etc etc. We can do this all day.
Oh, and there are ton of official government open source projects.
And no, "but they're not as big as a FAAG" does not mean that the software isn't good or innovative.