I'm going to guess because that topic was covered in the 1990s, making it harder for a new researcher to come up with a novel idea. For example, quoting "Subli

I'm going to guess because that topic was covered in the 1990s, making it harder for a new researcher to come up with a novel idea. For example, quoting "Sublinear growth of information in DNA sequences", Giulia Menconi, https://academic.oup.com/nar/article/32/suppl_2/W628/1040725?login=false https://academic.oup.com/nar/article/32/suppl_2/W628/1040725... from 2005: > The Lempel–Ziv complexity measure is based on text segmentation; we have termed it a ‘complexity decomposition’. It may be interpreted as the representation of a text in terms of repeats. Initially, this approach was implemented for analyzing DNA by Gusev and coauthors (13,14). 13 is Gusev,V.D., Kulichkov,V.A. and Chupakhina,O.M. (1991) Complexity analysis of genomes. I. Complexity and classification methods of detected structural regularities. Mol. Biol. (Mosk). 25 , 825–834. 14 is Gusev,V.D., Nemytikova,L.A. and Chuzhanova,N.A. (1999) On the complexity measures of genetic sequences. Bioinformatics, 15, 994–999. Google Scholar has 326 matches for "Lempel-Ziv power law dna" at or before 2010, for example, "Entropy and predictability of information carriers" from 1995 with "The capability to describe the structure of information carriers as DNA, proteins, texts and musical strings is investigated.".