When I saw that Earth Strike was organizing itself initially through Discord, I had lost a fair amount of hope in that project ever maintaining its momentum. The leadership model was centralized in the same way as its technologies for connecting leaders in the effort.
Do you know what happened to them? One ex-moderator in the organizing server sabotaged the server (and subreddit) in spite. They've been recovering ever since.
Moving away from the platforms that have sucked us in and exploited us, at a scale big enough to send a clear, revolutionary message to capital, is going to take principles, not convenience; it's going to take us collectively deciding that no matter the convenience of corporate walled garden platforms, we need to stick to communications mediums that reflect the freedom we want that we do not have under capital.
Many options exist, but they are withering away, and inertia is hell to fight.
Or, howabout, imagine if police departments began creating profiles of people based on their interests exposed through internet data collection, and started pre-emptively monitoring and surveilling people who are "prone to crime". You can immediately imagine how this might be used to enforce hierarchies and systemic abuses.
It is, of course, one thing to educate people on how to migrate to and use technologies and platforms that _aren't_ selling us out; moving large communities over from Discord to e.g. IRC is incredibly nontrivial from a social standpoint.
The other part is we need to make people aware of how dangerous this data goldmining is for survival under capital. The only real example I can give is how insurance providers can, and probably do, use purchase data to hike premiums on at-risk people.