conceal your IP in non peer to peer games based on the settings under “Steam / Settings / In-Game / Steam Networking”

Good tip thanks! Here’s the Steam page about it. The upshot seems to be that Steam itself won’t reveal your IP to others, but games might depending on how multiplayer is implemented.

“Steam doesn’t share your IP address with other players. Whenever peer-to-peer networking is needed, for example in a voice chat, that communication is always relayed. However, we don’t control what games using peer-to-peer connectivity do.”