ZDL spelled it out :
He said using wadsmoosh didn't work for whatever reason. I have no idea on this as I'm not a modder.
He might get in trouble for sharing "copyright" content which he edited manually.
He was asking for funds to support his time to create things (work for hire) and he was developing VR Hexen / VR Heretic but does not have a VR goggle set. He was asking for Patreon to support some of those costs.
He literally gave the wad away for free, no payment, if you just asked him via PM.
He did ASK if users can help him out in terms of donating for the labor.
Then he got hit with a ton of requests for the wad so diverted those requests to consider his Patreon. He still gave the wad away for free if you simply PM him, if the user could have; not counting those new users who need XYZ posts before allowed to be able to PM.
Then this whole thing blew up from that point on.
You can verify this by searching this very thread how many people thanked him for the "mod". Ask them how much they were forced to pay.