I think it's for running nodejs not "browser js" (via aws lambda or similar) without leaving the browser. I guess it's novel because it makes it easier to execute random nodejs?
> Padding and the input string are limited to anywhere between 1000 and 1024 characters in the free version, because we have to monetize to have enough runway to launch `right-pad.io` in Q3 2017 and annoying your customers into upgrades is a tried and true startup business development strategy