Apple has cut the commission on in-app purchases made through affiliates from 7% to 2.5%. However, they either backtracked or offered a reinterpretation on applying that change to all affiliate purchases made from the websites of partners linking to iOS and macOS apps, as well as movies and music.
Initially, the announcement covered all purchases made from affiliate links but that was quickly changed to just in-app purchases - either because of a bunch of pissed off affiliates or, as the company says, because their initial announcement was misinterpreted.
While a cut to the commission on in-app purchases isn't great for affiliates it does make sense. Given many in-app purchases are either subscription renewals or driven by effort made by developers rather than affiliates, it seems reasonable.
On the other hand, I don't think it's a coincidence that this change comes on the back of tightening revenues according to Apple's most recent earnings report.