But it shouldn't be necessary, nor is "can" any reasonable defense. The same goes for the BS about "open standard" web that is actually just Google-controlled and churning constantly to anticompetitively maintain their monopoly.
It's up to sites if they want to require an open standard and risk losing clients that haven't implemented it yet.
>churning constantly to anticompetitively maintain their monopoly.
Google open sources the implementations of these. Competing browsers like Brave and Edge are able to integrate this open source code to support them without themselves having to deal with constantly implementing new features.
Meanwhile Google actively blocks and attempts to pursue legal action against scrapers. Not to mention prohibiting it through TOS (getting your Google account revoked can be life-ruining for many people).