> Whenever I leave a company

Whenever I start at a company I create a "firewall"[0] between everything. No personal stuff on company machines, no work stuff on personal machines. I don't want them spying on my personal life. I'm not sure why others are okay with their employers spying on them and having access to their devices.

[0] I'm worried if I don't put in quotes people will think I just create a VLAN. I do that but I also mean it in the non technical sense. e.g. if a company wants to use smartphone apps I tell them to give me a company phone, they don't get to use mine for free.