We often use default systems to chat in cyberspace.
Only a very few bother about data privacy while online communication.
How does it matter if our chat data aren't peer-to-peer and end-to-end encrypted?
Then the chatting platform can spy on our private chat data and may use/sell it to third parties or even to our competitor companies!
Hackers can steal our private communication data in transit. But end-to-end encryption enables the sender to send encrypted data that only an authorized receiver can decrypt.