Relevant part of https://jamulus.io/wiki/Privacy-Statement
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‣ Use of Profile Information

When you connect to a public or private Jamulus server, whatever you put
in My Profile (in Settings) will be shown to others on that server while
you are connected to it. The server does not otherwise store or record
your Profile information and the server operator has no access to it
unless they are also connected as a client.

When you connect to a public server, your profile is also available to
third parties from the Central Server to which that server is
registered. This is can be for informational purposes about the status
of the public Jamulus network (for example, here), but may not be
limited to that. Profile information is not otherwise logged or stored
by the Jamulus server you are connected to, or by the Jamulus Central
Server, but may be stored or processed by third parties.

‣ Use of IP Addresses

When you connect to a public or private server, the server operator can
see your IP address while you are connected. If the server operator has
enabled logging (which is off by default) your IP address will also be
logged and stored in the server’s log file.

As a server operator, when you register a public server with a Central
Server, your IP address is sent to CloudFlare (1.1.1.1) in order to
identify your public IP address. The IP addresses of all public servers
registered with the Central Server can also be seen by third parties for
informational or other purposes (for example here). Your public IP
address is otherwise not logged or stored by Jamulus, but may be stored
or processed by third parties.

Users concerned by the use of CloudFlare’s network can re-compile the
Jamulus source code to use an alternative for
WELL_KNOWN_HOST/WELL_KNOWN_PORT in global.h

‣ Audio Recordings

You will see a notice if you are connected to a Jamulus server while
server recording is turned on. Recordings of each player are stored by
the server separately as .WAV files and only the server operator has
access to them.

‣ Text Chat

When you type a message in the Chat Window, other connected players can
see that, but chats are not stored by the server and neither the server
operator nor any third parties have access to them.