I am guessing you never had any problems with them if you are comfortable hodling that much in there.
Out of interest i want to ask that have you done any KYC for them since you had a significant enough balance for 1 btc interest.
Or have you tried to withdraw any significant amounts? I am just determing if they would ask kyc in that situation.
I have never heard of any situation where freebitco.in demanded users to do KYC. My biggest withdrawals were only of around 30 000 satoshis but I am pretty sure must have withdrawn with no issues. If they would have been issues or a request of KYC, I am pretty sure, complaints would have popped here on this forum.