ant-libp2p-tcp is used at run time in 2 crates (of which 1 optionally). It's used only as a dev dependency in 5 crates (of which 4 directly).

Depender (with downloads and own rev deps) ant-libp2p-tcp version
110 1 ant-libp2p-swarm-test ^0.42.0
120 ant-libp2p optional ^0.42.0
120 1 ant-libp2p-quic dev ^0.42.0
120 1 ant-libp2p-websocket dev ^0.42.0
110 2 ant-libp2p-dcutr dev ^0.42.0
110 ant-libp2p-mdns dev ^0.42.0