How are chargebacks handled on the App store? I would assume a scam like this will receive a relatively enormous number of chargebacks.
Not willingly and probably not a full month, but I could imagine that some users accidentally subscribe to the $100 "trial" period - it really is just a quick Touch ID press away. The price and charge frequency is listed in a small font size for a brief moment before you press that button. I guess many users will stop that subscriptions once the first charge is done...and they are able to find the subscription options buried deep in the iOS settings app. Considering how essential subscriptions are these days I find it troubling that managing them is such a well hidden feature in iOS.
I mean, I'm sure there will be a few who don't notice, but it seems likely that chargebacks would be through the roof.
Later on I did successfully get a refund for being charged twice for the same content when I bought it again on a family-shared device. Free tip: in-app purchases apparently aren't sharable to the family.