Only in the US. Outside the US even iOS users are forced to use whatsapp to a great extent because they’re a minority; most people outside the US have non-apple devices and whatsapp is the best way to communicate with them.
Furthermore, outside the US whatsapp is more than just a social network, it’s a work tool. Many businesses use it for their work such restaurants and stores to take orders from customers or car workshops to communicate with their customers. Other independent workers such as plumbers, electricians, carpenters, etc use it to communicate with their customers as well. In some countries such as Mexico even the government uses whatsapp because being multi platform it can reach far more people than using imessage. Right now they even have an automated phone number that people can contact via whatsapp to download ther covid vaccination certificate (of course there’s also the alternative of using a website for those who prefer it).