Did you contact freebitco.in.in support team to inform them about this. You should do this ASAP so they can investigate what happened and fix the problem in case there is a vulnerability in their website.
Based on the information you shared it's unlikely that your device or network are compromised since there are other victims and the hacker is targeting high rollers, so all he has is their IDs.
No, at least not yet.
I think I don't have enough evidence to prove anything.
It looks like you're not the only one who experienced this since march, some of its users too complained on their ANN thread
[1], you can make a post there too linking this thread. But as long as there's no response from TheQuin, this will not be cleared. Maybe this is just a technical issue of not reflecting the new address's balance or what, lastly the site might be hacked that way, i hope it's no though. But for the mean time, what you need to do is to wait and don't try to deposit again on the site.
[1]
https://bitcointalk.org/index.php?topic=319540.9100Yeah, since my account could be compromised will definitely not deposit there anything soon.
I have changed my password, but still have some security concerns.
For sure attacker can't withdraw anything because of 2FA.
If he managed to hijack my session he can harm me by using my balance to gamble and loose it on purpose.
I was able to withdraw my all BTC funds, but there is still quite big bag of Fun Tokens left.
For now they are locked, I will try to reach them when FUN savings matured.