The iron law of web encrapification: every web feature will (if possible) be employed to abuse the user, usually to push advertising.
It really comes down to JavaScript. The web was fine when sites were static HTML, images, and forms with server-side rendering (allowing for forums and blogs).
This is the price we pay for openness and decentralization.
On one side, we have Apple giving us great APIs but telling us how to use them. On the other, we have W3C being extremely conservative with what they expose, exactly because of things like this.
Those features that can't be used to show more ads will be used for fingerprinting.
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I cannot even reliably press [Space] any more to page down through sites that are meant to be all about content!