Interesting nugget: $9.99 a month unless you buy it through the iOS app and then you'll pay $12.99 a month. Google is making that Apple Tax quite clear.
IIRC that's for services and digital products only available inside the app store app, but not for external services and physical goods. This is an external service that happens to also be available via an app.
Spotify is doing similar. I thought Apple had a rule that you couldn't price in-app payments differently, but maybe it changed at some point?
Word is Apple relaxed the requirement as otherwise none of these services would permit iOS purchases at all. Basically, Apple changed the rules for specific companies in order to make money. And most iOS users are unlikely to be concerned with the price difference.