Earlier quoted context omitted.
I've only heard of this happening in the US and Canada. Outside of North America, everyone uses Whatsapp, which supports group messaging on every platform. I'd be curious to know why it hasn't penetrated into those countries.
I think it has to do with the fact that the US (and Canada) very early on had unlimited texting plans, and iMessage would make use of that (iPhones just send texts for iMessages in absence of a data connection). WhatsApp can only use data, which is cheaper and used to be unlimited (that's gone) in the EU. In contrast, texting was and still is insanely expensive in the EU (per byte it is staggering even, compared to n…
Imagine if every state in the US was a different country. That's basically Europe. Say you got charged roaming fees every time you traveled from New York to Connecticut. This was true in Europe until they passed regulation that mandated compatibility.
Wi-fi had no roaming upcharge. Hence why texting that works over wi-fi became the default.