I just wanted to address a single point from your comment:
Lemmy does not offer end-to-end encryption by default, which means that your messages could be intercepted by someone who is able to access your ISP’s network
If the Lemmy server is using HTTPS, nobody at your ISP or anywhere else between you and the Lemmy server should be able to read your messages (they could see that you are exchanging data with a particular host, but not the contents).