I think that, while naming people is inappropriate and not constructive (example: grad student complaining about their supervisor Prof. Doe to be a mean, mean person), publishers are another story.
As commercial operations, they accept to be public entities and it's practical to the community to be able to discuss about a specific company, the same way we discuss the pros and cons of, say, a reference manager software. For example, there are several question about the online editorial website of Elsevier.
Additionally, if a scholar is wondering about a given publisher, chances are the query will be more along the line of: Is Lambert Academic Publishing a reputable company? than 'What is the process to evaluate the shadyness of a given publisher'.
There are also multiple comments and answers that are critical about the business model of established publishers and I think it's very well, but we should also be able to nominatively criticize the smaller, less experienced, and especially the dishonest ones.