Earlier quoted context omitted.
I believe they mean iOS in-app purchases when they say "ApplePay". Swap the two out mentally while reading, and it makes a bit more sense. To be honest, I'm very surprised by that mistake, given where it's published – I'd hope that people working on GNU Taler understand the basics of their competitive environment.
Yea, that makes more sense, but still seems incorrect? Just on my phone, several apps let me subscribe via the Apple AppStore but also by subscribing on their website with a credit card (like Discord, NYT, AllTrails, HBO, etc) And that’s not even considering that when I pay for an in-app purchase… I’m paying with my credit card. Apple takes their cut, but it’s still my Amex or visa or whatever that I’m using via my A…
This is one of the few historical exemptions from Apple's otherwise ironclad IAP rules for so-called "reader apps".
Still, until very recently, these apps could not even mention that you can buy content/subscriptions on their website for cheaper (or, in some cases like the Kindle app, exclusively buy it there), let alone link to said website.
Now, the landscape is somewhat fragmented: In the EU, thanks to the DMA, external linking to external payment methods is allowed, but comes with a "scare sheet" and still grants Apple a cut of 20%(!). (This is about to change, I believe, but I'm not super up to date on it.)
In the US, developers can now apparently link to external payment sites (in SAfari) without Apple being allowed to charge a commission at all. This is a very recent development, and I haven't seen it in action myself.