What 4chan's terms say
4chan's terms of service and privacy policy have 15 rated points: 1 serious, 2 bad, 9 worth knowing and 3 good. 5 apply whenever you use the site, signed in or not; 10 only once you have an account.
Whenever you use 4chan
Bad 1
Per the service's terms, you may not express negative opinions about them
Per the service's terms, users may not express negative opinions about them
Where it says this ↗
Worth knowing 4
Spidering, crawling, or accessing the site through any automated means is not allowed
Users cannot scrape the website of the service
Where it says this ↗You agree not to use the service for illegal purposes
Instructions are provided on how to submit a copyright claim
Harming minors in any ways is prohibited
If you have a 4chan account
Serious 1
Specific content can be deleted without reason and may be removed without prior notice
Bad 1
Your account can be deleted or permanently suspended without prior notice and without a reason
Worth knowing 5
This service is only available to users over a certain age
This service is only available to users of a certain age
Where it says this ↗If you are the target of a copyright claim, your content and/or your account may be removed
If you are the target of a copyright claim, your content may be removed
Banned users are prohibited from creating a new account
You are prohibited from sending chain letters, junk mail, spam or any unsolicited messages
Your content can be deleted if you violate the terms
Good 3
If you are the target of a copyright holder's take down notice, this service gives you the opportunity to defend yourself
Your account may be suspended and/or terminated for breaching the Terms of Service
User accounts can be terminated after having been in breach of the terms of service repeatedly
You are prohibited from publishing any third party’s personally identifiable information without their consent
The publishing of personally identifiable information without the owner’s consent is not allowed
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.