I think people have gotten very used to the monthly subscribtion model for a variety of things. Lots of pay this much and get this every month. Patreon is adjacent to that concept but it isn't that, and I think it throws a lot of people off.
Part of the problem is that many patreon campaigns are effectively used as a monthly subscription service, even by this dev during the Noxian Nights days.
Honestly, with the way things are done i personally feel patreon is one of the worst, if not the worst, crowdfunding for how often it's a scam or misused. While most one time crowdfunding campaigns are a bit harder to continuously scam money out of, since people getting burned once by someone makes it much harder to continue the scam for anyone, while patreon is much easier to claim issues in production and never actually releasing a complete project or massively slowing releases while treating it as a subscription.
I honestly have no issue with a patreon campaign acting as a subscription service for artists, game devs for early access, video producers, exc. Hell, I personally supported the NN campaign. The problem is that many of them basically do advertise as subscription services and end up not keeping to their advertised schedule. The way I see a fix for that is what was attempted by YummieTiger (I think that's the name at least). While the game is basically on hold now it was originally pitched to be a per update campaign, having a specific number of updates for the complete game listed up front. Even the NN days were basically like that, where you knew you'd get a certain amount of content per month and it was consistent every month, though they didn't list a number of updates until complete.
Of course, as I said earlier in this thread, it's all down to the individual if a given campaign is worth it for what you get out of it. I personally won't support most campaigns now because I got burned by some in the past (and also don't have the spare money to support it right now).