In an ideal commerce environment reputation would only define trust that this is a real identity and not an impersonation along with a rating on completed transaction for survives or goods. The social reputation distorts this because something like a denial of service attack on a reputation that costs nothing to orchestrate could knock out a competing product or service. This leads to cronyism which might attract the eyes of regulators to such a purported platform engaged in commerce because cronyism distorts prices and stifles competition (maybe not for the apps as OP pointed out but for the users engaged in commerce).

Nostr currently is not engaged in much actual commerce and is more akin to a sponsorship level of monetary exchange. The reputation value for seeking sponsors or subscribers rather than customers are completely different. A customer wants a product and that product to fulfill a need. A subscriber is feeding an addiction. Someone seeking a sponsor is promising value based on how reputation is defined on a social rather than commerce basis.