In France, the fight against "sectarian deviations" (a term that currently has no legal definition) requires suspending the online social media accounts of offenders (conspiracy theorists: anti-vaxxers, climate denialists etc.), and blocking their access.
Platform providers are under the obligation to enforce such penalties. For example, the nostr CEO could face a penalty up to 75,000 euros if he fails to block the suspended accounts as required.
https://www.assemblee-nationale.fr/dyn/opendata/PRJLANR5L16BTC2157.html