It has always puzzled my why anyone began to assume they did have this privacy. I have been around long enough to see the token ring to ethernet transition, and (formerly) as a network engineer trying to jam web 1.5 business through a fractional T1. Never mind your privacy, all that network throughput and CPU is paid for and hard-fought-for and it costs a lot in CAPEX and OPEX. Getting to do a little online banking or email on work gear has always seemed like a short term scam to me.
Can you put a bitcoin rig under your desk and use your employer's electricity to make money? Yeah, if it looks like a footrest, until the culture and policy catch up. This already happened with postage and long distance phone calls.
You never had a right to privacy on work computers. We all pretended it was a little perk for a few years, but the risk pf letting you do personal stuff is not worth it anymore for companies of a certain size.