What view are you using? I see the empty "Sponsored Content" boxes on the slides view, but nothing on small cards (my preferred setting).

It's definitely heavily geared towards iOS design principles, but if you can get past that wefwef.app has been the most stable and smooth experience I've found, despite being a PWA and not a native app.

Ljdawson has a patreon if you want to be able to contribute now.