Oh this very much reminds me of [feldera](https://feldera.com) — they do incremental loads and computations using some novel approaches (most of which i am too dumb to follow). Really nice folks too.
I took a brief look into Drasi and it looks like it doesn't do any of the differential/timely dataflow stuff (like Materialize does), or any other sophisticated incremental view maintenance methods that are rooted in Microsoft Research.
