Fines , however you define them
are just smaller bits of bean.
French Presses ( made in FR ) sold in USA
used to include a very fine nylon mesh
that pretty much eliminated the smaller fines , ie fin sediment in your cup
those same brands , made in France , sold in France , do not include that
some fines are thought to be desirable in a cup in France.
if you are getting too many times w your burr grinder
you should consider getting a better burr grinder.
check to see if your FP has that nylon screen .
https://www.amazon.com/Bodum-Chambord-French-Coffee-Chrome/dp/B00008XEWG?th=1
Boded used to include the nylon screen in USA , and not FR.
its a matter of degree of fines , and ones interest in eliminating them.
fines are just coffee that's a bit over extracted , based on whatever extraction method you use.
I doubt commercially they are purposely eliminated .
but back to your question :
I don't know of any commercial sifting of ground coffee to eliminate fines.
