>and the customer has no idea there's a way to get a better price.

Wouldn't you look for more information outside the appstore before you buy into a subscription? I mean if you do that you should stumble upon the actual price and maybe an explanation for the higher price in the appstore.

It's less a problem for Basecamp than for Spotify, who have a more mainstream product and audience.

Unclear to me, but this might disallow a higher price for Apple in-app purchases:

> 3.1.3(b) [...] You must not directly or indirectly target iOS users to use a purchasing method other than in-app purchase, and your general communications about other purchasing methods must not discourage use of in-app purchase.

from https://developer.apple.com/app-store/review/guidelines/#mul...

They could just price it atronomically high in the app, like a bug, which will trigger people to reach out to others or investigate.

I don't think this type of clever lawyering is going to work when you're against a corporation that rules with an iron fist.

Well if the app tells me it costs $X, I have no reason to doubt it and double-check on the web. Unless I know about that Apple policy, but most consumers don't.