Germany will be removed from the registration form for crypto accounts shortly.
Thanks for admitting your website wasn't up to date.
The answer to your question dated back 9 months ago, where our team said that crypto accounts might be registered from Germany, is not actually the case at this moment. We do not accept German players anymore even Crypto.
That's all fine, and you can of course change who can or can't play. But you should let them know BEFORE they win on your site. Now you're playing both sides: if someone wins, they can't withdraw, and if someone loses, you take their money too. There's a name for that: scamming.
All information about the rules applying towards the gambling activity of the German citizens and related restrictions you can find out on the official site of the German authority.
That's also a lousy excuse. You can't expect people to check external sites, if you can't even keep your own site up to date. If German regulators really changed rules for your site, you should have instantly notified the players who confirmed to reside in Germany.
Side note: gambling regulation is meant to protect citizens from scammers, but in reality regulation is often used by shady sites as an excuse to scam players.