Agree. But practically they may claim using such data to improve their systems. This is a valid LI justification. But still it provides no benefits to users to whom those data are collected from, while at the same time increases their risks (such as mishandling of their data - which is common since it’s very difficult to handle data 100% correctly).

Legitimate interest is their interest, not yours.

The explanation of auto-renew says: “On expiration, new port forwardings will be created. The source port will be chosen randomly.”. How will that work with bt client?