Fortunately it's not true. GrapheneOS seem https://xcancel.com/GrapheneOS/status/1993061892324311480#m to be reacting to news coverage https://archive.ph/UrlvK saying that although legitimate uses exist, if GrapheneOS have connections to a criminal organization and refuse to cooperate with law enforcement, they could be prosecuted nonetheless:

« il existe pour une certaine partie des utilisateurs une réelle légitimité dans la volonté de protéger ses échanges. L’approche est donc différente. Mais ça ne nous empêchera pas de poursuivre les éditeurs, si des liens sont découverts avec une organisation criminelle et qu’ils ne coopèrent pas avec la justice. »

Charitably, GrapheneOS are not in fact a front for organized crime, but merely paranoid, assuming that the news coverage is laying the groundwork for prosecution on trumped-up charges. Notably, there doesn't appear to have been direct communication from law enforcement yet.

>Charitably, GrapheneOS are not in fact a front for organized crime, but merely paranoid

The difference between someone being paranoid and someone being right, is time.