Paraphrasing the video: Like sheets, but with structured data (columns define data types with relationships) and complex actions/triggers via bots.
Per your original comment, given Google's track record with customer performance//services being dead on arrival, I can imagine few here are interested in learning//migrating their workflow just to be locked out or migrating away not long after.
I'd link to the myriad of hn//twitter//medium posts used to get customer support through bad press, but I'm on mobile, I'll leave that as an exercise to the user.
[1] promo-oriented development
What is the most successful or longest lived Area 120 product?
Are you sure this is what you wanted to link?
I'm not linked to any of them, Notion's just the one I've used (not really any more), but all seem the same basic idea.
(Depending how you use Notion I suppose - you could just write paragraphs of notes and never see it as a database type thing, I didn't use it for notes like that.)
There's definitely some overlap with the two. This Google project is just more akin to AirTable than Notion.
So I won't invest my time considering it.