Everyone has to stop using that as an excuse. It doesn't even make sense & it's myopic. Obsolescence is built into Windows. If you want to continue being safe using Windows you NEED to upgrade. You can choose not to upgrade, but it's at your detriment.
It's a choice until it's not.
entitled -- to give (a person or thing) a title, right, or claim to something
I spent my money, I can be entitled. Besides this isn't just about libdvdcss. There are many withdrawn features and anti-features included.
No, you didn't. You spend $0 on Windows 10.
You spent money on Windows 7 and you can continue to use that without restriction.
You absolutely are acting entitled for something which is free.
Honestly I get the strong sense we wouldn't even be having this discussion if Windows 10 was NOT free i.e. if it costs $100. Since then people would simply not feel compelled to upgrade, instead it is free for a limited period, so people feel compelled and are now complaining about being "forced" to.
The reality is you can use Windows 7 until 2020. Just go ahead and do that then.