You can Opt Out for 90 days or Opt Back In to journeymap.info's use of Google Analytics at any time.
JourneyMap uses ModInfo to send a single anonymous packet to Google Analytics when the mod is loaded for the very first time. No personally-identifying data is used or tracked by JourneyMap in game.
ModInfo gives the authors of JourneyMap a broad sense of how many installs there are and what versions of Minecraft to support. It also helps them to know what languages to support. No personally-identifying data is used or tracked by ModInfo.
See ModInfo for information on how to opt-out.