These kind of arrangements generally get the investors their money back plus a modest return. The employees generally don’t get much, relative to the risk they took.
Buying the team and having them all quit is such a bad outcome for AWS, especially they would not keep any of the IP, which is owned by the DuckDB Foundation. I don't think they would be that short-sighted.
Is profit sharing, like what you're implying, actually happening? If so, in what quantity?