There are lots of comments and posts giving the false impression that Sync is tracking you outside of what is needed to support ads, including posts showing trackers from websites that are linked through lemmy and not part of sync at all (you would get those same trackers just browsing vanilla lemmy and clicking through a link)
You can do your own tracker analysis on the App. When you pay to disable ads all tracking goes away, which lines up with the developers claims that he doesn't even load those libraries through the ad SDK when you aren't on the ad supported version.
And yeah, this is distributed through the play store, if that's an issue for you, you don't need to download it, but like... that's not the misinformation I'm talking about.