It's been a fact of life for as long as I can remember. If you using the companies resources, they are well within their rights to monitor what you are doing.
Just don't use the company stuff and you are fine.
I agree with you. But do you remember when we could chat with a colleague about how much of a doofus our boss was without worrying that some automated system would possibly notify the boss about it? Nowadays big brother is always watching.