Not only FUN tokens, but all cryptocurrencies need to be stored in non-custodial (self-custodial) wallets, and if possible open-source wallets too.
It's not a new advice but such one has existed many years as "Not your keys, not your coins/ tokens".
True, but if you don't lock FUN tokens on the site (as we lock some other coins/tokens in other casinos/services), you can't stake them, and have other benefits from that staking. So we need to risk here & there... But as always, follow the golden rule: never invest/stake/gamble/RISK more than you can afford to lose.
I saw the price of FUN token today, pretty crazy... Freebitcoin is one of the craziest stories in the crypto world, and I don't see any near end. Of course, there's a good chance they will just disappear... but there's also a good chance for some other outcome.