A hiring contract isn't Terms of Service or a EULA. Your job isn't a service to you, it's an employer. You make a deal with a company in which you offer your time and expertise for pay and amenities. That contract with the company binds them as much as it binds you.

Anything non-monetary that they take away from you should be offered in compensation and/or renegotiation. You should not be allowing changes to your employment contract without approval, especially ones where they are removing amenities.