What are your thoughts on computer hardware which is much more restrictive? Video game consoles, for example, require all code to be cryptographically signed, meaning that third parties can't publish any software whatsoever without the blessing of the console manufacturer.

I'm assuming they don't like that either.

Apple does plenty of bad things, and many are worse than this, but it doesn't mean it's not fair to point out this one is bad, too.

It all comes down to "the vendor can do things with your computer you can't do yourself" in the end.

I'm generally opposed to that as well. Agreeing with Muromec's reply, I don't think it is necessarily anticompetitive in the case where the console vendor doesn't favor its first party games, but of course all three do that in practice. The situation is somewhat mitigated by the existence of a flourishing open market alternative (PC games).

More broadly, and not based on antitrust grounds but on property rights grounds, I am opposed to every kind of DRM. First, it should be legal to circumvent any and all DRM/anti-copying measures. Second, it should be illegal to deprive the next owner of their property rights so that you can exert ownership control over a product past its sale.

If I buy a computer, do nothing but install a keylogging rootkit on it, and sell it on to someone else, I would rightly risk jail time. "The malware is part of the product" is not a valid excuse. DRM is also malware. It should be prosecuted as such, and if existing legislation is found wanting, more specific laws need to be written.