Censorship is censorship even if it's possible to get a thing through some other means. For example, if a library banned books by Mark Twain, yet you could get it from another library or from Amazon, or in another country, most reasonable people would still call that censorship. If all the governments on Earth got together and outlawed Mark Twain, that would be censorship even if in theory you could fly to Mars, and buy/possess/read Mark Twain there.

The danger comes partly in the so-called tyranny of the majority. Just because the majority prefers something over the minority doesn't necessarily mean it's right. Also, just because the iOS App Store has a heavy-handed approach to adult content and yet it's doing well financially, it doesn't mean (1) that it couldn't do even better if it didn't have the heavy-handed approach, and (2) that all markets/channels should adopt the same approach. Those conclusions just do not follow, in my judgment.

Also, while Apple does many smart things, they are not perfect. I would not rule out them doing something you or I might consider as monumentally stupid. They are human. They make mistakes, and they have a different perspective, and their interests are not always aligned with ours.

By your logic then every company that sells any kind of product is engaged in censorship because they don't carry every possible product ever made. Also, I didn't say Apple couldn't do monumentally stupid things, I said if they did they would know about it when it affects their bottom line.

I would be careful applying a term like “censorship” to non-goverment actors like companies. It’s part of their freedom to “censor” – if you like that term – and I think that’s ok as long as they are not a monopoly.

A store is not a public library. Apple is not the government.