Yeah, it is. But that wasn't the question. MS Office SaaS or Adobe Creative Cloud is expensive too. AWS/GCloud is already quite pricey as it is, and every cloudified thing they roll out is just a money pump for people who don't know better.

But if you want to roll your own, then you can, it's FOSS after all. kubeadm works very well.

Comparing Synology with anything Google is silly, but useful. You can rent dedicated machines easily. Leaseweb is nice. And then you can build your infrastructure for cheaper.