Same with me from Cex.io located in UK,we don't consider earnings from different websites as valid source of income,also I sent them proof of mining and they ignored that too by claiming to not be valid while I sent them,pictures and videos,something which I regret deeply as I invaded my privacy by doing this.
this is very strange because last year at cex.io they asked me for income statement and i said i won at stake.com casino and i showed all transactions and cex.io just told me i could no longer make deposits from one casino for their website but that I was allowed to withdraw from binance to cex.io that is, they accept exchanges, maybe they just don't accept casinos I don't understand why they accept deposits in cryptocurrencies when they know that people won't be able to deliver declaration documents income?
However regarding Stake I have seen people withdraw huge amounts of money in Stake without problems,I know Stake is the top casino at the moment with huge offerings and bonuses and most likely that is why only newbie accounts start threads about having issues with them.
The OP needs to clarify this whole story better, this part he told doesn't make sense, the ocasino wouldn't wake up and out of nowhere ask the OP to deliver an income statement, there has to be something serious for them to get to ask this
OP did you deposit in cryptos only and how often and what amounts (minimum and maximum)?
how often did you win and when did you check level 1 and 2?
what was your last bet and you won the bet and how much had you bet?