Propaganda is common though. Many companies have their own newsletter and plenty do paid advertising, some in subtle ways. Plenty of scientific research is paid for by companies for their own gain. Authors are destined to propagate their own opinion and mind. That doesn’t however means anything that’s not complete neutral is pointless. An echo chamber is very much like propaganda, few people is going to speak out against the majority. Our training should be to obtain useful information from the massively available information, not disregard everything.