Earlier quoted context omitted.
With technology which is an order of magnitude more concerned with reliability and easier to use than any competition out there, that's how.
By using Solaris / re-implementig KVM on different arch / platform, ofc it's the wrong approach, on one side you what 100s eng at Joyent working on that, where the rest of the world uses native KVM, x86, Linux ect ... it's just not possible on a tech level to compete.
Then there is COMSTAR, a reference fiberchannel and iSCSI implementation. illumos inherited the reference NFS V3 and V4 implementations from Solaris. The runtime linker is so advanced in respect to versioned interfaces that it looks like it's magical. The list could go on and on and on... Linux is nowhere near any of that. Linux barely works somehow but when it comes to running serious infrastructure and data integrity, that's not enough. Just because most people think bash completion and GNU commands are what makes GNU/Linux superior doesn't mean that it actually is: it's very crude and unreliable underneath, especially since you have armies of people constantly hacking on it and breaking kernel interfaces, especially in networking. Try running a firewall / VPN company with it to see what a nightmare it is. And that's just one instance.
And then there is cloud: nothing that GNU/Linux has comes even remotely close to how simple, secure and fast Solaris zones in SmartOS are. Literally nothing: I can pull an image with imgadm and instantiate a bare metal performance UNIX®️ or GNU/Linux virtual server in under 25 seconds with vmadm. No Kubernetes or Docker or OpenVZ or Terraform can do that, and those are all afterthought bolt-ons, while imgadm and vmadm are core of SmartOS and its reason of existence.