See w3c/csswg-drafts#2664 for discussion and CSSWG decision.

Change would be in https://svgwg.org/svg2-draft/styling.html#UAStyleSheet

HTML UA stylesheet for comparison: https://html.spec.whatwg.org/multipage/rendering.html#phrasing-content-3

Some browsers already apply the pointer cursor to SVG links, others only apply it to HTML-namespaced links.