For example, the financial companies I used to work for had a “standard practice” of archiving all e-mails and internal chats for 7-8 years. Not sure if phone calls on company equipment were recorded or retained though (may be a YMMV case).
This is why I separate work and personal assets. I never do work on personal devices nor do I use work devices for personal activities (ie, social media, e-commerce, shit posting). Also if I’m shit talking the boss’s boss. It’s never using work devices.
Have been asked a few times to use personal devices for work but absolutely refused. I would be asked to install their invasive spyware and root kits so they can abide by their draconian corporate policies. So far, they haven’t forced me otherwise I would have quit those companies long ago.