Best question, right here. I suspect, someone is relying on there being a Marketplace for "pluggable react components". I know you know...it's a mess...

Open source licenses allow commercial use so probably not fit for Open Source. If your project is NC it can't be open source.

So yeah, I don't know who would be the target, probably very niche.

In-house tools, reports, dashboards.

Seconding this. Almost all of these "tabular" (although this a bit different) components frequently talk about their in-house tooling pricing. It's a big market.

Similar pricing, suspiciously https://jspreadsheet.com/pricing

That would probably be commercial. The term NC is actually a real can of worms. Either genuine non commercial work (government or non profit but they can be commercial) or as an evaluation/ prototype licence.

Let's be real - why would you use anything but excel for this?

Not dissing excel, it’s fantastic, depending on your shop there are plenty of scenarios it doesn’t fit. Windows only, this can be a big one. Deployment and auth difficulties when having connections to custom data sources. Customizing visualization. Displaying side-by-side with some other data. Excel isn’t free either, unless you are already fully invested in it. Your shop has better skills in js than vbscript.