I'm surprised that this company is just now adding net restrictions. Most large companies have had all sorts of Internet restrictions in place for a long time.
I understand the reasons, network security and primarily to keep employees with their nose to the grindstone and not checking up on their favorite websites.
A new trend is to not allow any Internet access from a normal corporate network with some exceptions for certain people that have to use the Internet for the business.
Yep, the smart phone is the answer or the counter-intelligence