Honestly, could be a mix of both. If people pirated it, they don't give a rat's ass about the Patreon and are happy enough with mods for a while. Likewise, even if people bought it, they'd have low expectations to receive any mainline animations and, once again, have to go for mods or bust. The Early Access tag on Steam is proof of this, so if they expected more, too bad. Then they'd realize how long the project has been going for, and buyer's remorse sets in, bwhahah. Weird predicament, eh? We jest, but even worse still, any Discord belonging to a porn animator/team could spiral into echo-chamber territory, so any valid criticism can be thrown out the window with a dish of belittlement and/or a ban. Those reactions don't lie, eh? >_>BunRot fans?
jokes aside, i think there's 2 options why people are celebrating
1- everyone is fine because they're distracted consuming mods
or
2- major of the people didn't support Patreon, so they doesn't care if Bunfan are getting released 2034