For the latter, bills have been paid long ago (sunk costs), titles are carried in inventory at or close to zero cost, and direct mail campaigns will create a low cost of goods sold and will be able to sustain a lower rate of response.
A browser is software that is used to access the internet. A browser lets you visit websites and do activities within them like login, view multimedia, link from one site to another, visit one page from another, print, send and receive email, among many other activities.
A browser isn't on there because Apple didn't bother, and Apple didn't bother because it no longer sees web browsing as central to its ecosystem. In the desktop era, the World Wide Web was so central to the experience of the internet that for years the most popular web browser was literally called Internet Explorer.