Why are WCF Services are considered as loosely coupled?

I like WCF concept in .net and its really a good feature to work with. I have created few WCF services and I like them the most over web services.

Anyway coming to the topic ,

WCF Services are considered as loosely coupled because WCF services are not tightly bound to a particular protocol, encoding format, or hosting environment. All of these are configurable. At the time of designing WCF services, we donot have to worry about what protocol, encoding format, or hosting environment to use to expose the service. We can worry about all these at the time of deployment..

http://faktree.blogspot.com/2018/05/why-are-wcf-services-are-considered-as.html