I don't think that's true. In the areas in which "bring your own client" is the standard ("text editors / IDE, RSS readers, email clients, web browsers" to cit

I don't think that's true. In the areas in which "bring your own client" is the standard ("text editors / IDE, RSS readers, email clients, web browsers" to cite the article), there is a seemingly greater diversity in hosting than when it comes to the backends of the services mentioned. Yes, many of these _may_ use AWS in the end, but there is a great many of them that don't.