And google (.... or alphabet)? Between their domination of mobile OS and search engines, I think they have equal lasting strength as Amazon. Plus their communication tools aren't exactly uncommon either, albeit replaceable.
Google became a verb which demonstrates a solid position. I was interviewing at Yahoo and was given a project problem. The interview said "Feel free to Google stuff to build the project", I joked back "Don't you mean Yahoo it?" He laughed and said "No, you can use Google. We all use Google here, it's fine."
I think they're pretty dominant