If we want to make the situation better for customers then companies like Apple and Google should provide subscription management/payment API for IAPs for free to developers so developers are incentivized to use the centralized platform. Customers can manage and cancel payments through that centralized platform. The only reason developers come up with these roundabout methods for payment is because of the massive fees that Google and Apple have.
Steam isn't a monopoly like Apple and Google are with their respective marketplaces so it doesn't make sense to compare the two. If I want to publish or play a game there are a lot of different ways to do so that don't involve Steam.
Well even with all the available competition most developers seem to consider the 30% fee on Steam fair enough to host their games there. So maybe that 15/30% is not as ‘massive’ as one might think, especially considering that the app store model was massive improvement over what existed before them. Not that I’m a huge fan of closed ecosystems in general, but I’m not sure the government should dictate what sort of software features manufacturers should implement on their devices. Especially considering that most consumers don’t really value the ability to freely install any software they want on their devices and seem to be fine with the closed garden approach.
Governments regulate all sorts of features on all sorts of products: building codes, electrical codes, car mpg requirements, how planes work, tax requirements, how corporations are allowed to function, the rights of citizens, ...
