Well, check up in this thread for a list of a lot of examples.
I don't believe people, and much more, hackers, would deny that PC and technology gets more restrictive, and companies like to push that as much as they can.
Here's a few examples:
1) You could change the memory of a Mac laptop (but not with current versions where it's purposefully glud to the board).
2) You could expand a Mac Pro, change GPU, even CPU, etc (but not with the new version).
3) You could change the battery of older iPods, not with newer models, iPhones or iPads.
In general, todays more prevalent forms, from laptops to tablets are not user servicable like desktops (and even laptops) used to be.
4) You used to run anything on OS X without any restrictions. Now OS X added code signing and a mode that only let's you run signed-apps (and another mode that only let's you run only App Store apps).
5) Older (windows) tablets run everything. Then the iPad come that only runs iTunes Store iOS apps (without a jailbreak). Every company started adding stores (Play store, Windows store) to their offerings.
6) You could change GUI themes in Mac OS (Kaleidoscope, etc). Not with OS X.
7) Windows just needed a serial code from the box you bought. Then internet activation became mandatory. In general, software using the internet for purchase validation was few and optional. Now most software has some form of mandatory "activation" step.
8) You could buy Creative Suite in a box and use it forever. Now subscription is mandatory.
You can find tons more examples. Either stuff gets incrementally locked down or something cames along and replaces the previous form with a more restricted newer one.
You might want to reduce your sarcasm and read on this:
