The Kunena team has announce the arrival of Kunena 6.1.0 [K 6.1.0] which is now available for download as a native Joomla extension for J! 4.3.x & J! 4.2.x. This version addresses most of the issues that were discovered in K 6.0 and issues discovered during the development stages of K 6.0
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Solved
Can a telecommunications company trace the IP address of someone who posts a message on a forum?
IP adresses are stored because of it gives administrator ability to find out if someone is boosting his ranks by creating fake accounts -- or for example if you are trying to stop spammer. The feature is configurable and you can also remove stored IP addresses from the backend.
But yes, they also provide a way to track down the user if needed by legal investigation. In most countries there are regulations that restrict this ability to only if court rules that it's needed to find the person.