Where are the real suppliers behind the panels you see advertised?

Usually out of sight. Many public panels do not produce engagement themselves; they resell from larger upstream sources through an API. Those sources rarely deal with individual buyers — they operate wholesale, privately, and let resellers handle the retail front.

So the site you buy from may be several steps from where delivery actually comes from, with markup and promises added at each step.

The 'provider' is often just the last, loudest link in a hidden chain. Compare services on track record, not their claimed place in it, in our directory.