Amazon isn't the same thing as AWS. Amazon might have bought Fig and kept the team separate, or they might've kept the tech and shortly after let the team go.
It's much more common for the acquired company to continue as an entity in its own right with only the board changing in the short term, and often continuing as a brand within the acquirer's business in the long term. Integrating a existing team into a company is hard. That said, Amazon has a lot of experience doing exactly that. I think they'll be fine.
