Privacy Policy link is not working after Reset to factory defaults.

That link should show https://musescore.com/legal/privacy
I see no reason why it wouldn't work, except maybe for a local firewall?

Instead of a full factory reset you could test this also by deleting the "starup\telemetry_access_requested" and "telemetry\allowed" entries of the MuseScore3.ini file.

Doing that I can confirm the issue, MuseScore 3.6.2, 64bit, Windows 10.

Looking at the code:

                TextLabel {
                    anchors {
                        horizontalCenter: parent.horizontalCenter
                    }
 
                    text: qsTr("For more information, please take a look at our %1Privacy Policy%2").arg("<a href=\"https://musescore.com/legal/privacy\">").arg("</a>")
 
                    onLinkActivated: {
                        permissionModel.openLink(link)
                    }
                }

seems to reveal that while the message is using the correct URL, the method to open that links uses an unset/empty variable link, so this probably never worked.

Nah, that's not it, it seems. Clicking that link results in:

Warning: qrc:/qml/TextLabel.qml:56: Error: Insufficient arguments (qrc:/qml/TextLabel.qml:56, )

Simple fix:

diff --git a/telemetry/qml/TextLabel.qml b/telemetry/qml/TextLabel.qml
index 9a484584bf..2172a017b5 100644
--- a/telemetry/qml/TextLabel.qml
+++ b/telemetry/qml/TextLabel.qml
@@ -53,7 +53,7 @@ FocusableItem {
         color: "#373737"
 
         onLinkActivated: {
-            root.linkActivated()
+            root.linkActivated(link)
         }
     }
 }

I don't find the corresponding code in master though, so I guess MuseScore 4 won't contain any telemetry anymore?
In that case, as there won't be any further 3.x version, we can probably close this issue as "Won't fix" (but I'll add the above fix to my https://github.com/musescore/MuseScore/pull/9000, just in case)

Indeeed telemetry has been removed, so won't be in MuseScore 4