Allora...
Ho riprovato e mi hanno negato una seconda volta la richiesta, ma questa volta rispondendomi così.
** ATTENTION **

Your application for a Non-Profit License has been denied for the following reasons:

* Your website has content which is in violation of our NPL usage agreement (such as advertising or donation request buttons, etc).


To protect your privacy, we do NOT retain denied applications. Therefore, if you wish to correct the above problems, you must reapply by visiting the following url:

http://npl.teamspeakusa.com/

After we receive your new application, it will be reviewed by a member of our staff, typically within two business days.

Thank you.
Le uniche cose che potevano far negare la richiesta erano le pubblicità in 2 video di youtube e qualche link a siti esterni che facevano uso di pubblicità nei loro siti.
Tra vedere e non vedere ho levato "tutto" e dopo aver riprovato una terza volta...
Conngratulations!

Your TeamSpeak 3 Non-Profit License has now been issued.

TO ACTIVATE YOUR LICENSE:
1) Place the attached licensekey.dat file on the root directory of your TeamSpeak 3 Server installation folder.
2) STOP AND RESTART the TeamSpeak 3 Server master binary (exe) process.

Please DO NOT share your licensekey.dat file with ANYONE outside of your registered organization. Doing so may cause your license to be SUSPENDED.

Thank you.
Grazie per l'aiuto Kaos
Spero che almeno questo post possa essere d'aiuto ad altri.