Email is a great example, despite what the article says. You can certainly have email without Google. If fact, Microsoft may actually be bigger in the business world.

A lot of large companies also run their own servers, consumers can use icloud, protonmail, yahoo,... or the one from their ISP.

The argument in the article is that GMail controls email. It is definitely not true. Email is still how people do business, and business email is not owned by Google.