I'm still trying to wrap my head around this whole thing but I'm pretty sure it's because Sync allows it to happen. I've been using multiple Lemmy apps for months now, and I'm sure I'd have at least accidentally clicked on some links. However, none of the FOSS apps have ever shown up on DDG, not even once. To confirm this, I've just clicked on a whole bunch of ads and links (even the shady ones) on all the apps, including Reddit, all of which are only opened in embedded browsers. Apart from Sync and Reddit's tracking attempts going through the roof on DDG, none of the other apps even showed up.
Devs should, at the very least, have the power to implement privacy restrictions in embedded browsers and pick non-tracking advertisements, none of which Sync has been doing, as they have clearly said so in their Privacy Policy (credits to being honest, I guess?).
Can someone who has paid $20 for the ad-free version confirm that this stops happening (or not) once the ads are gone?