Yeah, it will eventually support having blacklists. So if you get a cease-and-desist letter, you can simply blacklist the offending content. It doesn't completely solve the issue, but it should help mitigate getting into legal trouble with it.
For anonymous content, you'd probably have to handle the encryption/decryption yourself and use IPFS as the distribution.
It supports blacklists now too. The bigger mitigation is that IPFS is a "push" and not a "pull" system, so you only store content you have explicitly requested.
Yep, and even the content you've explicitly accessed, it's garbage collected unless you pin it. So that helps further mitigate the issue, in case you mistakenly stumble upon undesirable content.
For anonymous content, you'd probably have to handle the encryption/decryption yourself and use IPFS as the distribution.