Just a public service announcement for anyone that hasn't seen the news yet over in the Splinterlands discord but there are hackers accessing people's accounts and stealing all of their DEC, cards and even going as far as to take land plots too.
Splnterlands has recommended using your active key or forcing the active key setting to be turned on to require the use of your active key for any financial related transactions but you can also accomplish the same thing by using Hive Keychain too.
Just make sure to keep a close eye on your cards and assets over there because it sounds like it's already happened to several people.