vCPU-based Spot Instance Limits are Now Available in Amazon EC2
In 2019 we launched Amazon EC2’s vCPU-based limits for On-Demand Instances to simplify the limit management experience for EC2 customers. Now, we have also made the same improvements for Amazon EC2 Spot Instances. We have migrated the account limit for Spot Instances from being instance based to a vCPU based limit experience. Starting today, you will be able to manage Spot limits from the Amazon EC2 console and the Service Quotas console.
Source:: Amazon AWS