Following is my honest review about 1xbit.com and their reputation.
I have recently been tagged as not trustable for applying to their signature campaign.

I won 1mBTC in the 1xbit euro 2020 game.
The minimum btc withdrawal amount on 1xbit is 5mBTC however.
I started playing some slots and ended up with 3mBTC so I decided to send another 2mBTC to my 1xbit wallet.
I was able to withdraw a full 5.11mBTC to be precise and received the correct amount within a few hours (6$ transactions fees have been payed by 1xbit).
Since there are many warning signs about 1xbit, I would advise to be very cautious about handling high amounts on this site.

my btc address:
bc1q9utwezd6emgmza47g7sac0cvzv7pdzhlay587p