I think that the lag and HTTP error 500 and request errors and stuff arent caused by an update or an error on imgflips end but rather whoever is spam downvoting and low rating everything is causing the servers to lag
This might be a stretch but maybe whoever is doing this is some extremely salty user who is/was very hated that's trying to get the site shutdown as "revenge", although I honestly have no clue what user that would even be, but I wouldn't be surprised if such user existed