I mean, Telegram is compromised and Telegram is notorious for PDF files to distribute that shit.
Also if people are going to use the "Well as long as you're not doing anything wrong, you shouldn't be worried" excuse, the government loves to label sites like KF and other places as potential "threats" that sends the glowies looking at us all the time.
Kirsche only makes the Telegram distinction if the person in question has other pedophile tendencies. We all know the patterns, because you know how good we are at pattern noticing.