AWS has raised the prices of its EC2 Capacity Blocks for ML by approximately 15%, affecting customers who reserve specific GPU instances for machine learning workloads. The price increase was made without prior notice, with the company citing supply and demand patterns as the reason. This move has raised concerns among customers and competitors, who see it as a potential trend in cloud pricing. The increase may impact companies with Enterprise Discount Programs or other negotiated agreements, potentially leading to higher costs.