I wrote https://remy.grunblatt.org/blog/kobo-aura-h2o-hacking.html a while ago. At some point it sent ISBN to google.

The domain I extracted for my kobo aura:

  api.ipinfodb.com
  api.kobobooks.com
  auth.kobobooks.com
  authorize.kobo.com
  kbdownload1-a.akamaihd.net
  kbimages1-a.akamaihd.net
  mobile.kobobooks.com
  pool.ntp.org
  script.hotjar.com
  social.kobobooks.com
  ssl.google-analytics.com
  static.hotjar.com
  stats.g.doubleclick.net
  storeapi.kobo.com
  vars.hotjar.com
  www.google-analytics.com
  www.google.com
  www.google.fr
  www.googletagmanager.com
  www.msftncsi.com