@J12t mastodon is terrible for activism. it's public, or not encrypted, and not heavily scrutinized for security requirements.
use something encrypted, not federated (or restrict federation to trusted servers/instances), or peer to perr
briar, cwtch, matrix, xmpp, or signal are all better options.
bear in mind that activism is risky, and can be dangerous. your server admin is actually not likely to be competent to harden a server adequately to defend against a prepared adversary, and even if they were they might just cooperate with law enforcement anyway. they should be tantamount to an adversary themselves if they aren't a collaborator
@xyhhx the context of this post was that Threads is apparently used quite a bit for organizing in Taiwan. It’s not obvious to me that mastodon or other fediverse apps are any worse than Threads for that purpose, and may even be better?