How you want your software to be used and how you dictate that it be used are two different things to me.

Void the warranty for opening something? Fine. That's no different than requesting that we be allowed to install software on non-branded hardware and not expecting support.

The free AV use on commercial computers is also less than relevant, since we're talking about the ability to use things we legitimately paid for. You didn't pay for the free AV; if you had paid for the commercial AV and they didn't let you install it on your home PC, that might be equivalent.

As far as your other examples, I'm not up to speed on how exactly they're illegal, but I'll leave that to you to explain if you feel like it.