Reddit is the only platform that actually tells you that you are shadowbanned, so at least they are upfront about it, but their appeal system sucks. My friend just appealed every day for just over 600 days and finally got their account un-shadowbanned.

Reddit doesn't tell you you're shadowbanned. You are thinking of regular banned.

No, they have fully banned and shadowbanned. If you are shadowbanned you can login and check the appeals page but your posts and comments will no longer be visible. If you are fully banned you cannot log in.

That is called "muted". It is not a shadowban, by definition.

It doesn't say that your posts and comments are invisible - they just are.

"It only took two years for my friend to appeal a Ban"

If you're willing to wait a couple years, I dare say a few services might have changed their minds by then, so it's too early to judge.

Most of them don't even have a reasonable appeals process at all :(

Isn’t that definitionally impossible? If they tell you about it then it’s not a shadow ban.

I guess it depends on the definition of shadow ban.

In Reddit's case it means you can continue to post and comment, it's just that your posts and comments are no longer seen by others.

Reddit doesn't tell you about that.

No they don't and if they do tell you that means you have been banned.

HN also has shadowbans. If your preferences have showdead=yes, you might see some.

That's a decent moderation, shadowban is a totally different thing. AFAIK, your karma is enough to vouch that Flagged topics or comments and return that piece into a regular displaying.

There's no difference between shadowban and moderation, shadowban is a moderation tool.

Shadowban and community-driven moderation are different poles. Former is a tool of shallow narcisses, latter is the best moderation strategy possible in the clearnet. Come on, commenter.