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Correct me if I'm wrong, but users who used Freebitco.in only as faucet without gambling or having premium membership where getting much less than basic reward to not milk faucet too much.
I had been a Freebitcoin user, I used to collect Satoshis from their faucet several years ago and it was indeed a very slow process, but it was possible to make some money of one set up some alarm to ring every hour or so. I believe the bulk of people who actually make a relatively high amount of money got it thanks to their referral program, though. Since there have been some allegations Freebitcoin had been actually cheating their provably fair system in order to scam their gambler.
So I doubt there have been actual gambler who got a significant amount of money from gambling alone.
I never got into FUN tokens and I never deposited any Bitcoin for the sake of interest, because I always felt scared of relying my BTC to a big centralized entity, not matter their reputation.