Amazon benefits from the addition of Teradata AI Unlimited to its AWS Marketplace as it enriches the ecosystem with advanced AI/ML tools, potentially attracting a broader customer base. While Amazon is already a dominant player in the cloud market, partnerships with specialized services like Teradata's can further solidify its position and lead to increased usage of AWS services. This could have a positive short-term impact on Amazon's stock, although the effect might be less pronounced due to the company's already vast and diverse service offerings.

The launch of Teradata AI Unlimited on AWS is a significant development for Teradata, indicating an expansion of its cloud-based AI/ML offerings. This could lead to increased usage and customer base, especially as it leverages AWS's extensive reach and capabilities. The positive reception of this service could lead to a short-term uptick in Teradata's stock as investors may view this as a growth opportunity.