They are trying to develope enough dependency on them that they could stop being open source and the majority of browsers and websites dependent on their development just fold and allow google to control the internet.

Big companies only let stuff be open source in order to rugpull it if and when it would allow them to be successfully anticompetitive.

Standards are good. What's not good is that Google controls the standards.

Open source or not, Google currently has the ability to dictate web standards as they see fit.

Why? There are 2 reasons:

• Chrome has a 63.55% marketshare (as of the time of this writing) of all web browser usage
• Maintaining your own fork of Chromium or even your own separate browser engine (Like Firefox does) is extremely difficult.

There's a reason so many of these browsers just use Chromium. It's because Google is doing the Lion's share of the work. Modern web browsers are some of the most complicated pieces of software ever written. They are comparable in complexity to entire operating systems.

When Google makes a change to the Chromium project everyone follows suit, lest you fork it which leaves development and ensuring interoperability entirely up to you. The complexity of this task depends on how far you want to take your browser.

Even those who fork Chromium will pull changes made by Google to the original Chromium project because making and maintaining your own web browser is really, really difficult.