Repacked versions are notoriously unstable, leading to frequent crashes and database corruption. Blacklisting:

The official TeamSpeak 3 server license is available for purchase from the TeamSpeak website or authorized resellers. The cost of a license depends on the number of server slots and the duration of the license.

How to accept the server license agreement (Server >= 3.1.0)

For years, TeamSpeak offered a that allowed hobbyists to host up to 512 slots for free. However, obtaining this license eventually became difficult as TeamSpeak tightened requirements to prevent commercial abuse. This led to a thriving "underground" scene for cracked and repacked server licenses.