I appreciate the intent of this message, but how sure are you that federated social media like Lemmy is really any safer than Reddit? Not much on here is encrypted, to my knowledge, and instance admins need to respond to subpoenas just like anybody else... In the event of hostile government action, you're much better off communicating on E2EE platforms, and unfortunately, posting on public social media platforms is a risk.
You can mitigate much of that risk with a burner email and VPN, but you can do that on other platforms too.