It’s not, other than Google has a way larger market share (especially if you count Edge/Opera/Brave/etc.) and has been (ab)using that position to push web standards in a direction that favors their business and that other browser vendors have to follow to keep up.
If Safari had Chrome’s market share and was throwing their weight around like Google does and Microsoft did with IE, it’d be the same argument and I’d also personally support forcing them to divest it.