Is there a reason why Patreon doesn't just pull out of the App Store? Whenever I got Patreon rewards, I'd just get them in an email notification and the link there took me to the website. Worked great without having to download an app.
As a user, I strongly prefer websites for this sort of thing. I'll pay attention when it suits me, not when the service wants me to. It does explain why Patreon wants to have an app though.
I don't know why they badly want this - presumably for more user tracking, or because studies show that people engage more, or whatever - but pulling out of the app store would be at odds with this desire to push everyone into their app.
Browsers can have things like adblockers that keep you from collecting a very valuable commodity: data.
If your service forces me to auto-renew my subscription, I'm probably not gonna buy it.