Admittedly haven’t tried calling with it, that being said I still need to reinstall it on my main laptop (only recently switched to Linux on that, was using an old laptop with Linux before that), so I’ll try some stuff again

Last time I tried Viber, it ran fine on Linux, what issues have you had with it?

Discord also works pretty well, minus the white flashing when scrolling through GIFs for me

Per https://duckduckgo.com/duckduckgo-help-pages/results/sources/:

We also maintain our own crawler (DuckDuckBot) and many indexes to support our results. Of course, we have more traditional links and images in our search results too, which we largely source from Bing. Our focus is synthesizing all these sources to create a superior search experience.