“The closure also cut off access to the Funimation digital copies that came with DVDs and Blu-ray discs.”
Funimation sold discs with a digital copy and then shut the digital copy off. The movies are still on the discs. Copying them yourself breaks the DMCA, so buyers have to ask the Copyright Office for permission to keep what they paid for. Warner Bros. codes expire by release date, not purchase date, so a brand new disc can ship with a dead code.