I find warnings like this rather amusing, because unless you compiled it yourself, even an open source application could secretly have malicious data-harvesting code added to it.
F-Droid has verified and reproducible builds.
On the Play Store or iOS App Store, though, anything goes.
Isn’t the point of open source that you can check the code for yourself though? Can’t do that with closed source
Makes sense to be on that site, since a lot of Lemmy users are probably interested at least in part due to the FOSS nature of it. Maybe it doesn’t need to be phrased as a “warning” though, more just as an FYI. Seems like it could scare people away thinking it’s a data harvesting tool, but such is life.
The app does have ads(which may collect data) and it’s also closed source. They are not lying.