One is "I don't want to use Meta products as a matter of principle", and WhatsApp's a no-go if that's your posture.
The other is "I don't want to drown in horrible, algorithm-curated junk content". Instagram is just as bad as Facebook there, but WhatsApp is definitely not the same.
Updates are broadcasted, but they disappear after 24 hours.
Step 1) Keep updates for a week, later forever
Step 2) Mix Chats and Updates
Step 3) Add a few relevant patrocinated posts
Step 4) Change the css from green to blue
Step 5) Profit