The way it affects me is that now, developers are faced with the choice - adhere to Apple’s privacy standards or lose out on the lucrative iOS market. With side loading, they will have the further option of just telling people to side load their apps and not put them on the App Store.
This if I desire that the popular apps I use respect my privacy and avoid dark patterns (like making it impossible to cancel subscriptions), then them having an option to avoid Apple’s oversight makes it less likely that they will adhere to these standards.