I can see a dom source doing this for safety once they have built up a good list. But why would a Chinese seller go private when more should be better.
Not uncommon, I had another source from China that does not take any new orders from new clients now. They claim to serve their existing customers better. Its better than having some of these sources keep taking orders and then making you wait a month plus to receive.
Tried the powders were ok, never tried his GH. Service and T/A time were always top notch. I would usually receive in a week or less, no seizures ever.