Virtualbox is not a replacement...
When businesses say "vmware" they mean esxi/vsphere to manage large numbers of VMs, not desktop VMs, not vmware workstation... The replacement would be hyper-v, proxmox, xen or moving workloads to Microsoft 365, Azure, AWS or GCP.
Besides, vmware workstation is also vastly better and also given out for free now.
I believe that's correct.
The thing one must be cautious regarding is installing the Extension Pack without careful consideration.
This is all about managing and deploying applications across multiple servers (vSphere) which is a fleet of computers running ESXi as their operating system.
That being said, when the alternative is free, VMware really doesn't have the power it thinks it has to dictate terms.