Monopoly of what? Some other social networks I use every day or so: Twitter, LinkedIn, TikTok and various forums and communities like this one, which in my mind are pretty similar to a social network. And since WhatsApp is a chat app, how about all the other chat apps I am using? iMessage, Slack, Teams. Does this action has any merit or is it just the usual political posturing and games?
These don’t really compete with WhatsApp, which is cross platform, not tied to an employer, doesn’t require an invitation, subscription, friend network, setup to use, among other things.