It seems like anyone who inserts the letter "e" into the word "девушка" is just embarrassed to write the regular word.
Society does impose its own rules and habits, and it takes time to break free from them. "ДЭвушки" is largely a stage of escaping from terms like "баба," "телка," and other slang.
Or maybe some people just like it more >:3
Except the ones we've made