There are many examples all over the world. Plenty of countries have people that have attachments to apps like whatsapp, telegram, etc.

All of my friends in brazil, for instance, are entirely attached to whatsapp.

I agree with the other reply. Where do you live? I'm surprised that you haven't encountered any. Every city in the US that I visited and every city that I visited internationally has people that attach themselves to one of either whatsapp, telegram, imessage, etc.

(I'm kind of excluding wechat here because wechat seems to be forced, but there are plenty of people who have this attachment to wechat as well because of its status as an omni app)

The question is where you live where this is not the case. You're the outlier here.

I think it's not as prominent as this in the US - probably because the equivalent is Apple messaging systems, if your family / friend group is all in that?

Yes the US is one of the only rare places where Whatsapp is not omnipresent (and it is the only presence where RCS has any meaningful chance of ever being used.