It is about the now probably deleted post here. The post essentially advertises a site where cheap native speakers can be hired for training.
The first reaction is that it is obvious spam.
There is probably a very big need for similar services, and it is obviously not reachable for free. Thus, asking any of them, or mentioning any of them would fall unavoidably on the spam rules.
Second, it is useful... probably I will hire one of them. I couldn't even imagine that it is possible so cheaply.
I think, such answers aren't allowed on the general spam ban of the SE. But somewhere, somehow, some resources should be collected which can be really useful for many visitors.
Maybe similar things and resources could be collected in meta post(s)?