Are you referring to ActivityPub traffic (Mastodon, etc.)? Yes they're nominally using JSON-LD, but actually most devs seem to not have understood that ActivityStreams is just a projection of RDF triples into JSON. Instead they go with the part they did unterstand (because JSON is better than markup right?), and end up tunneling markdown or HTML through JSON strings and uneccessarily hardcoding their payloads in ORM layers in dynamic languages. If I were mean, I'd compare the situation to insects incapable of comprehending a 3D universe, clinging to syntactic surfaces that seem familiar.

But what can you do? At this point, keeping federated alternatives, protocol-first designs, and multiple interworking implementations is more important than purity; it might well be the last successful initiative of its kind.