gotcha, thanks for the link btw!

Is that only between an instance of discourse and the rest of fediverse? Does it also apply for different discourse instances talking to each other?

Essentially, I’m wondering whether I can use 1 account to comment across different forums.

Yes, though to a much lesser extent than I used to. Sometimes it’s just through web searches that lead to Reddit, though I use Libreddit front-end for that.

And other times, it’s specific subreddits about TV shows. The level and frequency of discussion on Lemmy sadly is not there yet for popular shows, and nonexistent for niche shows.

I’ve been seeing quite many older posts from 2-3 years ago popping up lately. Wonder why.

If it’s truly anonymous, as in the admin of that instance can’t even know where that comes from, then it’s truly a moderation nightmare. It is easier to spot and suspend/ban one person who makes multiple nazi posts or spam posts across different channels under one account, than it is with multiple posts from one person without any link. Even if it’s not truly “anonymous” on the admin end but only on the other viewing end, it is easier for other users to inspect and report from viewing that person’s history, which cannot be done when the posts cannot be linked to an individual. Of course, one can make multiple accounts, but allowing anonymous posts + multiple accounts would be even easier to automate hate speech/spam/disinfo/…