I live in the US, and there are 4 or 5 people I talk to via WhatsApp as our primary communications channel. I'm also a member of 2 or 3 group chats that are used occasionally that I get value out of. I managed to move one group chat over to Signal, but the others didn't budge. I also find that WhatsApp is often the go-to for short-term ad-hoc group chats, like for a bunch of people who are on a trip or vacation together.