Not all but I was in Sweden for some time and didn’t notice people using whatsapp

Most of the 3rd world countries use WhatsApp.

Depends on the person you’re trying to impress. If the person is Caucasian then make something bland otherwise add some spices.

Same. My next phone will be fairphone.

I am using thunder and its been great so far. Look and feel is like Infinity for Reddit. Its on Github and izzydroid repo in Fdroid.