You realize not everyone has an Apple phone don't you? And you realize it's nearly impossible to get any "friend group" to agree on one messaging service, right?
i already said it must be a „cultural“ thing I guess. Literally everyone and their grandmother uses WhatsApp here. MMS used to cost like 0,49€ each. Legit no one I know ever used a MMS. When I was a teenager, MMS launched but everyone that had a someone „up to date“ phone sent emails instead because it was super expensive to send an MMS. The first carriers actually discontinue the service somewhat soon. You learn something new every day I suppose