Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/Modules/Gambling/BlackJack/BlackJackService.cs

@@ -0,0 +1,9 @@
+#nullable disable
+using NadekoBot.Modules.Gambling.Common.Blackjack;
+
+namespace NadekoBot.Modules.Gambling.Services;
+
+public class BlackJackService : INService
+{
+    public ConcurrentDictionary<ulong, Blackjack> Games { get; } = new();
+}