[kick]

Morten Kromberg (big guy at Dyalog; coincidentally, author of the post we're discussing) in "justifying" why Dyalog isn't libre, just a few days ago: There is little risk of the demise of Dyalog APL any time soon. Our customers run businesses that are based on Dyalog APL with a combined annual turnover in excess of a billion euros/dollars.

https://chat.stackexchange.com/transcript/52405?m=56860424#5...

There are a few other companies with proprietary APL implementations that are also getting by really well.

k, which is pretty similar, is even more of a money-maker than Dyalog APL, having been responsible for a company worth a billion or more (Kx) and an entirely different company that also seems to be doing pretty well.

J also is used somewhat commonly, though less, and its users seem to be doing more than well, too (my current employer and most of my previous employers have been J shops, and none of them have gone under yet. I think a couple of them had record-breaking years in 2020). J is also free, libre software, so instead of paying for a Dyalog or K license, you should really just use it (or ngn/k, if k is more your thing).