Lightsail instances are just T2 instances, and they are not exempt from CPU credits. From https://aws.amazon.com/lightsail/faq/ https://aws.amazon.com/lightsai

Lightsail instances are just T2 instances, and they are not exempt from CPU credits. From https://aws.amazon.com/lightsail/faq/ https://aws.amazon.com/lightsail/faq/ > Lightsail uses burstable performance instances that provide a baseline level of CPU performance with the additional ability to burst above the baseline.