If it were possible to purchase Kagi licenses through the AWS Marketplace, then in many corporate environments it would be easier to use Kagi, since there is often a much less onerous approval process for spending that is classified under the AWS bill versus other software spend, for purely bureaucratic reasons.
This would be for professional use of Kagi at a company or startup. Other companies also employ the same strategy of offering licenses through AWS Marketplace, even if the service they provide is not actually hosted on AWS, for similar reasons.