The role of attrition against mainstream platforms (Discussion)

Mainstream platforms such as Meta and X have accumulated a near-universal audience that is the root of all their evil. From sentiment analysis mass experiments to propagandistic political advertising. Things are worse in third countries where they are even less moderated. So I was thinking that as long as FOSS/Privacy is just geeky and elitist they just keep doing business as usual, from enshitification to fascism. Additionally, people have moved their political posting, scheduling, discussion online, so this gives them more power. Like seeing anarchist groups on Facebook is cringe, but some insist that "that is where the mass is, perhaps we move to Instagram to get to more Zedders". Whaaaat? Questions: What tactics could be used to move people en masse away from mainstream platforms, and more generally, do you think there is a point in it?