Hello, I'll try to explain. 🙂
Technically each game provider should be licensed to provide its products - games - in certain countries. the same goes for the casino. Sometimes the games are restricted because this particular license is no longer valid, sometimes the game provider just does not want to offer the games anymore or the casino has not reached a partnership with the certain game provider.
There are many more possible reasons I'm afraid.
I'd suggest you check the general terms of use in the casino to find a part saying something about those game providers being restricted to players from...
Sadly, Austria is probably heavily restricted due to local law, I'd say.
Sometimes casinos provide even restricted games, but by doing so, they risk the game provider's wrath.
Another common case is that games (usually with a higher RTP) are restricted while playing with the bonus.
I hope that I covered the basics for you 🤔.
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