I don't think they need to check for valid URLs. My point is just that disguising text as a URL will be possible regardless unless you check for 404s or ellipsize the URLs. Using a URL shortener isn't necessary to make URLs count for a constant character length.
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I don't think they need to check for valid URLs. My point is just that disguising text as a URL will be possible regardless unless you check for 404s or ellipsize the URLs. Using a URL shortener isn't necessary to make URLs count for a constant character length.