Because it's pretty much worthless.
You almost never need just a basic list of all the data in your table, even if you're able to filter and sort it. There's no moat there at all. People need serious BI tools, and that throws simplicity out of the window (PowerBI, QuickSight, etc.).
I disagree, a lot of the time people buy "serious BI tools" precisely because they think they need all that power and complexity.
In reality, what most people need is much simpler, a mini app with some curated datasets and simple filters, maybe some AI querying if we want to get fancy. There's some companies out there that work with big data, but for the rest of us small data is ok.
I think of Datasette as a "small data" platform, where small data is anything that would fit on my phone.
My phone has 1TB of storage.
I've used that with companies I consult for, everyone thinks they should do what Google does, so sometimes I'll drop them the "your whole company data fits in my phone/laptop" line to make them understand the (lack of) scale
duckdb -ui
Data engineers hate this one simple trick