I've been learning about XSS recently, and then I was trying to come up with ways to bypass anti-XSS filters in browsers. I though, "Maybe if you used a link shortener that virtualized your site!", similar to how a proxy site virtualizes pages, or W3Schools' Try It Editor (except it doesn't show code). The concept is that a link shortener would use a suspicious link and render the page into a virtualizer.
For example, Bob finds an XSS vulnerability in a site and shorten it into a shortened link; any shortened link less suspicious than
https://vulnerable.com/<scRIPt>alert("XSSed!");</scriPT>. Bob would use the virtualizing URL shortener and put the above URL as the link and it would be virtualized into an
<iframe> or something and not warn the user of malicious code and then send it to someone, who would then click on it.
Would this work to bypass XSS filters? Does a site like this already exist?