alt Hacker NewsClosed source (and vibe-coded) software, especially for a language runtime, is a non-starter for many people including myself. But proprietary license is actually common in the APL and K family of languages. They are fascinating though, and plenty of free/open implemenations exist, for example: https://ktye.github.io/
the author of the site makes no secret that the website is vibecoded. You're unfairly extrapolating that the product itself is vibe-coded (hard to do unless he is a time-traveller). And you're missing the point of the unique advantages that L offers wrt computation on compressed data.