it's always been possible to access certain parts of ao3 on the wayback machine, but that only works if a person has backed up the link before, so unless you have the specific number code/link, it'll be hard to use ao3 normally
plus for sites like mangago you'll have to put every chapter in manually and hope someone has already backed it up
the internet archive also relies on donations like ao3, as it is a nonprofit, so it may lag with a sudden influx of users

i just saw a reel in insta say that we can access ao3 in wayback machine before it died so i was checking if mng could be checked too, and i logged in here all excited n shi to post that 'GUYS GROUNDBREAKING DISCOVERY AALERTTT" then i realised 'wait i should fact check' and i tried to turn btt on, which it did but i had to check if the manhwas re readable too, WAYBACK MACHINE JUST WENT OFFLINE.
Anyways, I need help from y'all. Pls try from ur devices and let's see if BTT, MNG, and AO3 can still be accessed thru Wayback, in case MNG goes down. Only after multiple checks can we establish it as an actual way...
also im well aware we cant get the updates of newer chapters or read new manhwas but if desperate times call for desperate measures, we atleast should be able to read the other uploaded manhwas....