On my behalf, I am 100% comfortable with it because in each case (save maybe ISP depending on where one lives), there are alternatives if a user doesn't like it."It's Apple's platform, they can do whatever they want."
OK, how comfortable are you with:
"It's Microsoft's OS, they can bundle or ban whatever software they want."
"It's Google's search engine, they can sort results however they want."
"You bought Comcast internet service; they can include whichever websites they want you to access."
While I can sympathize with people wanting to have software alternatives, I cannot sympathize with the outrage over not being allowed the option. Why? Because this has been Apple's policy for 150 years. If a person continues to buy iOS devices and continues to stay in the Apple ecosystem, that is their choice. The fact that Cydia and other alternative options are not allowed isn't a surprise to anyone.
It's almost like me going to McDonald's and buying lunch, then after I pay for my Big Mac I get upset that McDonald's doesn't offer a steak so I demand they change their menu to meet my wants. I knew what the deal was before going in.