Originally Posted by
Knaight
Going back to how CRISPR isn't magic (and neither are ERVs in general, which would be the major case for "viral") altering expressed DNA in a meaningful way in an adult organism is another one of those things we can't really do. If you were doing this to humans (and good luck getting that past review boards) you'd basically have to use egg/sperm cells, and even then there's all sorts of potential issues.
Just look at the attempts of biohackers, and how they've accomplished approximately nothing.