Wow so much unrelated drama combined with pretty interesting advertisement.

Do you work for Meta?

People don't use WhatsApp because it's so secure. In certain countries people started using it because it was the first app that was cheaper than SMS and now they use it because everybody else is still using it. There is no other significant reason.

They have a history of security issues going back to 2011 when you could take over other peoples account. Today is just the last story of this ugly and leaking brother to Signal. The actually "most secure" app out there.