because the literal expansion 'business intelligence' (or the explanation in the Wikipedia article) is hard to interpret as something that makes sense in contexts like this where you're apparently talking about features of software rather than social practices. the reference to 'bi cubes' makes me think that maybe it means 'olap'?
And no, MS ones aren't miles ahead of the competition. But are bundled with Office, so the competition is mostly going out of business by now.
That has been the differentiator. Power BI has lots going for and against it, but its database is miles ahead of competitors' report tools.
Edit: clarification: importing large volumes of data takes more than a few seconds. The query performance of the in-memory database after import is complete is what I referred to above in my original comment.
At some point in time, Decision Support Systems became Business Intelligence and nowadays this is switching ti AI
BI (formerly DSS) is a set of tools that enable Business Analytics , OLAP and technologies that implements OLAP (Cubes and Columnar databases) enables BI
OLAP/cubes usually underpins bi tooling, since the usecase is almost entirely across-the-board aggregations.