Yes, they may have submitted a lot of applications. Evisa in China is a bit different than US for example. In the US you chose the consulate based on your address and in China, you choose the consulate based on the place of issue of your passport. But I’ll be hesitant to hire an agent who suggests to apply for evisa while in Thailand.
some agents will create your portfolio by collecting the company documents and even write your cover letter to explain your situation. Of course, the letter is signed by the applicant.
If the agency is offering you to do your evisa while you are in Thailand, pretending that you are in your home country, then they are schemers. Scam alert.