thanks for your answer. I already wrote a message to this email address on Dec 19, 2022 and received this auto-reply message:
Thank you very much for your interest in free5GC. Except for stage 1, the license of free5GC follows Apache 2.0. That is, anyone can use free5GC for commercial purposes for free. We will not charge any license fee.
For technical questions, please ask on our official forum: https://forum.free5gc.org. Again, please ask your technical questions on the free5GC forum. You won’t receive any answers by email for technical questions.
free5GC Support Team
Since it’s probably a technical question, I created a ticket on GitHub on Dec 21, 2022 with the same question and also a question on the forum on Jan 29, 2023. So far I have not received a response through any channel.