It appears to me that it is not necessary that the dependent variable would come from count data. Please see the source, which gives examples of studies that have used fractional regression with fractional dependent variables that are based on various types of data.

Of course, this does not necessarily mean that these studies have been conducted correctly. Thus, I am open to hearing more opinions, arguments, and articles on that.

It appears to me that it is not necessary that the dependent variable would come from count data. Please see the source one and source two, which give examples of studies that have used fractional regression with fractional dependent variables that are based on various types of data.