When a service advertise as 100% open source, do you expect the website to be open-source too?

Long title, wopsi.

Recently been checking out PIA VPN service(for research purposes), and they advertise their services to be 100% open source. However when checking their Github they don't seem to have their code base for website there.

So this have had me wondering, when you hear the term 100% open source. Do you expect ALL of what they do, including website part, to be open source? Or just the application / service that they offer?

Lemmyknow your thoughts!