Besides If you use it as a smart watch they have all the data that they want, similar to all the other smart watches and phones in everyone's pocket.
My understanding is that this is only true if you connect the watch with bluetooth to a mobile device with the Garmin Connect or Dive apps. The watch does not upload data to Garmin directly. I verified this by looking at my Garmin account after doing a couple dozen activities on the watch, and Garmin still didn't have any of my data available to display.