I do not encourage anybody to hire the services of those companies.
Agreed.
The first reason is because the mother company is located in Pakistan, meaning their English levels will not be up to the international standards.
Agreed. Usually, that's obvious, just from their website copy. Unfortunately, I've learned from this forum (and from some of my customers who only found me after already having been ripped off) that many prospective customers aren't that good at recognizing some of the signs of horrible ESL writing that any professional NES writer (and any professor) would consider extremely obvious.
The second reason, is that these may be scam companies in disguise. Pakistan is not exactly known for being on the level when it comes to dealing with their clients, regardless of the business.
Agreed. In general, it's always much safer to use providers located in countries with functional criminal justice systems; and nothing is safer than using providers in countries with functional criminal justice systems who will also disclose their complete identification information that can be confirmed independently.