Not everyone who complained and got Apple to change course is an iOS developer. Especially regarding complaints involving contextually inappropriate ads (like that which I mentioned), you don’t even need to be an iOS developer to be upset by it. People dealing with addiction and those advocating for them have every right to loudly complain to Apple on that front.
And indeed, given that Apple specifically paused campaigns for specific app categories (not a huge leap to assume the other undisclosed categories are also related to addiction), that’s probably what managed to move the needle. Not so much a podcast app developer upset that gambling ads were being shown on his app’s page, although I do believe that developers who object to these apps should be able to opt out of “You Might Also Like” advertising for these possibly objectionable apps, whether that’s based on category, content/age ratings, or both.