Some people go by their initials normally. Perhaps because they have a dorky sounding name like "Clive Staples" or because "D.J." sounds cool.
A lot of people use a pseudonym for various reasons. I don't think adopting initials is really any different. Having married into a last name now that is difficult to pronounce, I can understand the many reasons an author might want to do this.
The authors I read tend to skew female. Possibly the majority of books sold (genre romance?) are written predominantly by women for women.
I also read m/m romance, and there are a lot of authors in that genre using initials. Again, this is a genre mostly written by women for women but it seems like there is a desire to either be a little gender neutral or preserve the illusion that the author could be male (an illusion usually lost the first time you read "about the author").
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