GCE virtual machine 6.0.3 doesn't use all memory assigned by hypervisor

Lukas,

is it mentioned somewhere? I didn’t find it in GCE vs GSE versions comparison, also, it is very strange that there is a requirement for GCE
Setup the GCE

Version: 6.0.3

Download: https://dl.greenbone.net/download/VM/gsm-ce-6.0.3.iso (526 MB)

sha256sum: 514b9e26219a910aa5de73a455f91b75c8ff9dd8ac1139e715101ce185672f33

Compatibility: VirtualBox, ESXi

Minimum requirements: 2 CPU Cores, 4 GB RAM

Why they mention as a requirement of minimum 4 GB RAM for GCE, if it supports maximum 3GB RAM