Quick answer
The official description says Private Servers are free. Use them for calm testing, route notes, and screenshots without crowded public-server noise.
Why use one
A private server makes it easier to test mining runs, offline-return claims, and rebirth prompts cleanly.
What is verified
Only the wording 'Private Servers are free' is treated as verified from the official description.
What to avoid
Do not assume private servers change rewards, rates, or drops unless the game itself says so.
Evidence boundary
Useful, but not overclaimed.
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