I’ve never tried having the app on multiple devices - I specifically didn’t want it on my phone - but it’s worth a try. I use whatsapp web in firefox, and only start waydroid when I need to log in again. The third party linux apps just load whatsapp web in electron or something.
I assumed Qwant had a small, primarily french index which was mixed with bing results. Their article mentions the new index will be based on existing qwant technologies. Do you have a link to where they admit to not having any index at all?