YOURLS is disabled in our Softaculous installation, because URL shorteners are frowned upon on free hosting. Spammers love abusing (unprotected) URL shorteners to hide their malicious links using other people’s domain names.
You’re free to install it by hand though. Just please make sure that only you, or at least only people you know and trust, are able to create short links with it. If we find your site is being used to disguise malware links, we’re holding you responsible.
Premium hosting does include YOURLS in Softaculous. But you’re still responsible for making sure it’s not being abused.