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SVGs also are mostly unsupported for og:image tags (dependents on the app/browser). I know it's supper specific and I am not even sure if open graph is standardized protocol or not, but it's used everywhere.

yeah, I was super disappointed to find that out when I built previews for https://hexrgb.pages.dev

What was the SVG that didn't work? In Jon's example in the original post, the SVG he embeds there was one he wrote in around 2005. That's a pretty impressive run for it to render 20 years on...

They are also not supported on iOS native apps. We use pdfs for vectors.