It's only 1 year, so if you HODL your coins 1 year, it's tax free profits.

But I'm not sure how long it will stay that way.
I'm very surprised that it hasn't been chanced already.

I read somewhere that this only applies to coins stored in custody wallets, is that correct?
If coins are stored centrally (exchange), it's also 1 year HODL until it's tax free but what's not tax free are
derivatives (also including stocks).
But profits from real coins are tax free after 1 year, not matter if people own these coins or coins are stored on an exchange account (Binance, Coinbase etc.).
I am of the opinion that Germany is not a country that changes laws just like that, despite the fact that this particular law seems rather strange from the perspective of those in power, and incredibly good for every investor.
It's in place for Gold ounces for example and called "private Veräußerungsgeschäfte" (private sale transactions) in Germany:
https://www.gesetze-im-internet.de/estg/__23.html
Croatia also has an identical model, with the difference that this period is 2 years, and that all crypto assets acquired before January 1, 2016 are tax-free. I think that such things will change only if a common agreement is reached at the level of the whole EU, which is completely unrealistic at the moment.
Yes, sounds reasonable but as far as I know, Austria has written new laws (reform) about crypto taxation recently.
Experts have said, it's a very crypto-friendly reform.