I have decided to shut down Wad Archive as I don't have time to dedicate to it anymore and just not motivated. I don't have an exact date/time yet but it is currently no longer updated.
Since I would rather not have the archive go to waste I have uploaded all the WADs, images and database data to the internet archive https://archive.org/details/wadarchive . The entire unpacked archive is around 1TB and is stored in a way that made it easier/faster for the server to use rather than for someone manually browsing the files. I won't be releasing the code for the website itself or the indexing code and I am not interested in allowing someone else to host it, feel free to create your own with the data. All the database files fit in the free tier at https://www.mongodb.com/atlas/database except for lumps.json.