I am a tax preparer for one of the companies mentioned. I do not hold an accounting degree. I had to take a class that the company offered and if I passed with an 80% or above, I was hired (that was 23 years ago). Each year thereafter I have to take classes that the company provides to keep my credentials and be rehired each year.

Even AARP offers free tax preparation services for those who cannot afford to go to the companies mentioned during tax season at various locations such as the library. And they are definitely not an accounting firm.