It’s actually possible to resolve… TLD as websites
Examples : http://pn • http://ai

Source :
• https://jameswillia.ms/posts/shortest-urls.html
Problems :
• https://www.icann.org/en/announcements/details/new-gtld-dotless-domain-names-prohibited-30-8-2013-en
• https://www.iab.org/documents/correspondence-reports-documents/2013-2/ iab-statement-dotless-domains-considered-harmful/
In a nutshell :
• https://www.bleepingcomputer.com/news/technology/dotless-domains-home-to-the-internet-s-shortest-urls/