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more than 3000 lines of inline css in the site source code, that's not a good sign

They're probably using their own system to design/maintain the CSS classes, and inline CSS is merely the output.

Not exactly "no walled garden" then if the output can't be managed by anything but the original program.

The output is generated, but the content is not walled: https://github.com/the-domains/vizualiphone