A number of Aiven plans, especially at the low-end, don't exactly match the resources provided by virtual machines in all clouds. The largest differences are with the Hobbyist and Startup-4 plans on DigitalOcean, where the droplets typically have more resources (CPU, RAM, disk space) than we advertise for our plans.
The reason for that is that our plans are defined in a way that allows us to offer the same plans in all clouds, making it possible to migrate workloads between the different clouds.
Resources available in each of the clouds vary especially on the smaller virtual machine sizes so we've defined our plans with resources that we can provide in all clouds. Some of the plans may provide more resources than advertised, but we reserve the right to scale down the VMs used to implement the services in case more suitable VM types are introduced by the cloud providers.