Why aren't all of them playable?

Here at the casino, I also get a message saying that cash is not available in my region. Why are these restrictions in place?

Hello, snooky. When you say "here at the casino," ... could you help us understand where this has occured? it seems the casino name is missing. One way or another, I would recommend asking support or checking whether players from your country are still allowed to play and cash out. Gambling regulations are still shifting and casinos sometimes respons. 🙂

Let me know what you found, please.

The issue is that not all games are available. Even Casino Guru displayed a message saying "not available in your region".

Well, that's correct and normal. No game provider provides its game to the whole world. It always depends on the licenses for the current market. And demo modes may behave the same. When it comes to free slot tournaments, we have to respect those restrictions too. For Germany, many games casinos and bonuses are, therefore, restricted.