Knoppix got really popular in Germany in the 2000s when it was still common that PC magazines were sold with CD-ROMs. Especially c't, Germany's most prestigious computer magazine, made Knoppix popular with their bootable Linux CDs for data rescue issues.

c't published articles about a few programs that I wrote (many years ago). They always sent me copies of the magazine with a CD when they did that. The CD had all the free/open source programs that were discussed in the magazine. Very good publisher.