This is stuff that used to take effort and was worth consuming just for that, and lots of people don't have their filter adjusted (much as the early advent of consumer-facing email spam) to account for how low effort and plentiful these forms of content are.
I can only hope that people raise their filters to a point where scrutinizing everything becomes common place and a message existing doesn't lend it any assumed legitimacy. Maybe AI will be the poison for propaganda (but I'm not holding my breath).