Yes this is legal….

Ghostwriting is a service that many people use, such as the presidents, artists, entrepreneurs, celebrities, authors, etc.

Is this plagiarism? No. Plagiarism is the theft of original work WITHOUT permission.

Ghostwriting, as a transaction, is common in commercial, trade, publishing, textbooks and politics. 
No attribution is needed. 

College is only becoming more demanding; people have families, work, school, and need time for themselves.

This company provides time, something we all can’t get back.