Whatsapp forwards is largely a solved problem. Now you can't forward whatsapp messages to more than 5 people at a go. And if you try doing 5 people at a time consecutively, your account is automatically deleted even before you reach 30 total forwards.
Some people adopted a strategy of adding users to a group and dropping whatever message they have but that too is solved by allowing only known contacts to add you to groups.
It is an interesting solution if nothing else. What about capping the number of users or followers to 100 or 1000 other people? That is closer to how humans interacted for the vast majority of history since the development of language. If you think about it, it's extremely unnatural for single people to have direct communication to millions of people. Information can still spread from social group to social group. I don't endorse the idea, but I would be interested to see how it might work and how information would spread and ideas change.
The subject of this thread is "how do you lessen the spread of misinformation?" across all of social media, and the parent claims that whatsapp has largely solved this problem. So we're talking about applying these restrictions much more broadly.
Some people adopted a strategy of adding users to a group and dropping whatever message they have but that too is solved by allowing only known contacts to add you to groups.