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Well it won't be dead. The vercel one seems to only support running on vercel.

They also have satori, which will run anywhere it seems.

That seems to generate svgs which as far as I know no site will show og embeds with svgs for some reason

I use svgs for my websites og images, haven't come across an issue with embeds on most platforms.

There are already a lot of choices to convert SVGs to PNGs, what Vercel uses is https://github.com/yisibl/resvg-js. And Sharp is another good option.