Well it still exists as Adobe Animate which can export to html.
Comparing SVG to Flash seems like an apples to oranges comparison anyway. The format does not have to do everything that Flash did but can rely on the other technologies in the browser.
Adobe Animate is a sad shell of Flash. It only supports 2D, where its ancient predecessor supported 3D 20 years ago. It is a largely dead product, although parts of the Flash spirit lives on in After Effects, which is a video-centric tool.
Comparing SVG to Flash seems like an apples to oranges comparison anyway. The format does not have to do everything that Flash did but can rely on the other technologies in the browser.