Do they use their internet dominance to invent a bunch of complex html elements so google becomes the only one being able to parse html effectively in the future? I hope not.
What's less natural is that so many other browsers/frameworks chose to be based upon it (like every Electron app in the world, Opera, Silk, Microsoft Edge real soon now™). Apart from Safari or Firefox, there aren't really many alternatives anymore.
Web devs and evangelists of the world, you brought this on yourselves.
I'm not just talking the talk here: I've spent significant amout of time (years) in implementing SGML and an SGML grammar for HTML5 [1].