That only works in dreamland. Banks and traders must record all calls by law, for example. https://www.bankingdive.com/news/sec-cftc-fine-11-banks-18b-...

> The Securities and Exchange Commission (SEC) and Commodity Futures Trading Commission (CFTC) fined 11 Wall Street banks and brokerages more than $1.8 billion in a long-anticipated move to curb finance employees’ use of unapproved messaging platforms and companies’ failures to keep accurate records of those communications, the regulators said Tuesday.

But it's not a "cool" tech company so you don't hear about it on HN.