And with a private server you can Admin-boost all the current players on that server you have been playing on so they can regain (almost) everything they have lost. Load up PIPPI mod so you can even boost the levels, etc. In almost no time they would be back to where they would be. Yes, the created content, etc would need to be redone, but (for some) that is often what some players enjoy.

(I would be completely stunned if Funcom risked breaching GDPR and info-protection by releasing any official server content to a private platform - and if my data was somewhere in there, I would also be reaching for someone in Legal to do some checking)