Juno does not use any trackers of any sort, nor does it keep, track, sell, rent, or share any information on you throughout your use of the app with any third parties.
As Juno browses YouTube, you are also beholden to YouTube's Privacy Policy. This is also indicated in Juno's App Store privacy "nutrition label", and I just want to be clear that the information shown there reflects YouTube's data collection from using the app, not collection performed by Juno (which is none).
For any questions, feel free to contact me directly.