i think that this notion has lost its teeth as the MSM has been converted into some boogeyman and/or strawman. MSM certainly caters to an audience, and people are drawn to likeminded people, sometimes deluding themselves into believing that participating in a near-homogenous echo chamber would be an ideal expression of peaceful living. once there, though, they realize that it's still not quite perfect. foxnews not "right" enough for me so let's create newsmax or oan. biden's not "left" enough and so we should have nominated warren or sanders. people are going to disagree and that's fundamentally a good thing. how we disagree is where things seem to have degenerated.
the whole "MSM agenda" seems like an incorrect and lazy narrative. they have agendas and they cater to the people who demand those agendas. i doubt, though, that newsmax employs people to troll my tweets disagreeing with desantis' signing of the florida abortion bill today, reporting them in an attempt to get me banned. the people trying to get me banned are the audience and they believe they're doing the correct thing to advance their cause by attempting to squelch me.
MSM pours fuel on the fire, but they don't start it. same for reddit - it's going to be the collective of people and their ability to tolerate differentiated thinking. they're not brainwashed zombies, they're collectives of similarly-minded people who give in to their predisposed biases as exploited by MSM/social media for profit.