The relayed ip is not a part of the bitcoin transaction. That is simply something displayed by blockchain.info for the node that relayed the transaction to them. This does not point to the node that originated the transaction and the ip addresses are not a part of anything in transactions or the blockchain.
Thanks for the clarification. But since blockchain.info is connected to lots of nodes, let's say I run node A, that connects only to node B. I restrict node A to a single connection. Whenever I send a transaction, then this transaction goes through B, that further propagates it on the network. If blockchain.info has a connection to node B, then node B will be listed as "relayed by ip" at blockchain, right?
I'm not sure if the ip of A is automatically logged at node B when issuing the tx, but at least the ip of A will not be shown on blockchain.info. In the event someone looks at the debug.log of node B, they might however see that the transaction came from node A.
Some person might then misinterpret "relayed by ip" as having a direct association with the tx in question, and thus try to get answers from the entity behind that ip. That was my point.