I'd wager there's a diff between a 54 second clip to a full feature in a film. The raffle clips are specified by the winners, so they do acquiesce to the requests.
There's also a year between the ada short and the Jill film, so its also possible they were given a warning about it inbetwen that time. Mila wasn't a one strike and you're out deal, they'd been having to deal with Patreon warnings for a while before the hammer came down.
One more possible factor: zombie models weren't exactly peak back then. The RE2 and 3 remakes wouldn't be for another chunk of years. Can't say for sure what models were doing that basic wandering in the opening, but I doubt they made for good lengthy content.
Personally I think using zombies would've been the weakest option, given the amount of creatures the RE series has. It'd be basically be the equivalent of a human gangbang, just with makeup
maybe they'll use them with the better quality models in the remakes, should they go back to the series. There won't be a patreon rug to pull, so they don't have to pull punches then. Which I'm sure they will, there's plenty more babes to tap, specially since Capcom keeps remaking all the ladies and improving them