I believe (could be wrong) many developers would be worried about using this.
Seems to me you're a small shop (?). AWS can get away with a proprietary DB API like DynamoDB's. They are big and can provide strong assurances.
Since SFSQL is just starting out, by a small shop, it would be a high risk to rely on it being a closed source, proprietary API.
Might be worth thinking about how you're going to address such concerns. Must have something really strong to support.