Hope he's prepared for a letter from nVidia's lawyers for breaking their license agreement for the RTX3090's.
A lot of places do it and just fly under the radar, but if you're going to publish a blog post bragging about it and how much money you are saving ...
The RTX datacenter restriction as far as read, but not a lawyer, is for data center providers like aws, ovh, hetzner etc to provide servers with these gpu and rent them.
Lambda sells "GPU workstation built for Deep Learning" with RTX 3090.