Unlikely. There's a number of other strong indications that basic maintenance was being neglected, including shell transcripts showing that at least one server was running FreeBSD 10.1 (released in 2014, end-of-life in 2018), and PHP code using the mysql extension (which was deprecated in PHP 5.6 = 2014 and removed in PHP 7.0 = 2015).

It's probably not a coincidence that 4chan was sold to a new owner in 2015.

agpl is no different than gpl if you're distributing applications. if you host the functionality of the application with improvements then it's rightly so cryptonite and you deserve it.