are there any anonymous board or forum besides 4chan?

Anything is anonymous if you register with a fake name and email.

That is pseudonymity, not anonymity
- But it really is equivalently pseudo-anonymous. Both are leaking equal amounts of info, assuming the fake email is only used for the one account.
- Just as anonymous as trip tags.

Looks like Slashdot no longer allows Anonymous Cowards. TIL.

(I'm not editorializing --- that's what you'd show up as if you posted anonymously.)

https://allchans.org/

I have not visted many of these so explore at your own risk.

Thank you very much bro!!

There are dozens, maybe hundreds of chans alone, and that's just one style of message board.

yup, found dozens like that. https://chatgpt.com/share/9d17779c-9401-47ca-b914-cc8efcc39297
- I can't believe you've done this.

Any other chan.

such as?
- Jackie
- Just put a number in front. I’m not gonna recommend any specific one because some of them have disturbing content.
- 8chan

In case of 4chan it's obviously other anonymous imageboards. There doesn't seem to functionality in Lemmy that would allow for posting without accounts.

Accounts (which contain the private key that signs the headers in your posts, and the public key to verify) are required for ActivityPub to work.
hmm, maybe I should open an issue on github about it? however it will make moderating communities difficult.
- Not possible really. The protocol Lemmy uses requires accounts, not only as a soft requirement, but the software your instance would be interacting with requires it to function.
I imagine it wouldn't be hard to add that functionality to an instance, but given the pearl clutching Lemmy instance admins are prone to it would be defed pretty quickly.
- It would be defed pretty quickly because all bots, alt right trolls, pedophiles and anyone looking to share illegal content would instantly flock to it.
- Sorry you being able to store child porn on my instance is considered pearl clutching. No fucking way I want that responsibility because I like to read memes.
- Tell you what: you go host that instance, with no pearl-clutching. Don't worry about any knocks at the door, or federal agents abseiling through your windows. You don't clutch no pearls, right?

The dark web has many truly anonymous forums, if you can tolerate the subject matter.

Tumblr, depending on where you go on there.

Isn't Lemmy pretty much that?

Lemmy is pseudoanonymous, not anonymous, since we all have noms de plume.
- The rest of you are all cowards. I use my real name on here.
Almost, I would guess OP is talking about places to post that doesn't require accounts.
actually it depends on which instance you have chosen and the privacy policy of chosen instance. my instance doesn't require an email so it's pretty much anonymous like 4chan. but I want to find out some different forum or board that isn't Lemmy.

Edit: plus you can't post without an account on Lemmy.
- It would be interesting to make a Lemmy fork that doesn’t require login and registers all posts as anonymous@(instance). Would probably get insta defederated by every other instance though lol