You can only exchange your coin to USDT or PM (PerfectMoney), yes exchanging it to USDT greatly reduces the withdrawal fee as well as the minimum withdrawal amount because the fee is only 1 USDT and min only 10 USDT, but as slow death has mentioned many players who use BTC to increase their BTC amount and do not like altcoins especially this condition of decline if exchanged to USDT will greatly reduce the value of BTC exchanged.

Based on that information and screenshot alone, it should be clear that he ought to stay away from Betja because US players aren't allowed. Trying to bypass this restriction by using a VPN can just lead to problems with fund seizure, account suspensions, and being accused of using multiple accounts. 

I like the fact that this casino has their own built in exchange . this is something that is rare to see in other casinos although the only problem is that not all coins are available for exchange. What could be the reason behind this?

But, there are still ltc and bnb, these two is already enough if we are going to withdraw but wants to cut the fees. About the minimum deposit, are there casinos that suddenly implements this? I think this is dangerous what if the player did not knew this, he will only wonder why his coins did not arrive. Minimum deposit is fine but only if your going to fulfil a welcome bonus or deposit bonus  .

Anyway, betja is not implementing minimum deposits here.
Based from their faq, https://betja.com/faq, they have no minimum or max deposit.
But of course, in terms of withdrawal, just check each coin their min amount as well as their fees.
You can easily check it in their withdraw tab, and select each coin and the min withdrawal + tx fee will be displayed.

I see that round 16 competition is available but it's harder than ever with mix of international matches, world cup qualifications, Championship and League One matches.
Whoever manages to win one of this competition lottery and $10,000 will be a genius or a very lucky person, but even $100 is not a bad reward

It's because the round hasn't finished yet still 2 matches to go.

And there's a typo actually the next round should be 20

Has anyone tried BetJa.com faucet that is located in Wallet > Free BTC ? It will give you 100 satoshi. It has a 1h timer. After one hours passes, I can collect it once again or I need to first spend my first 100sat?

In the promotion section it is written that The current amount is 100 satoshi and you can use it to place a bet (single or multi). But when I place a bet with I get "The total stake is more than your balance." message. Then how is it possible to use it to place a bet or use elsewhere?

In the Sportsbook Rules it is written "After three times claiming, you need to place at least a bet (Minimum odds 1.40) for claiming the next FREE BTC.". Can these claimed Free BTC be used for betting? If yes, then it looks like an infinite betting strategy testing platform

I have a question I have been meaning to ask regarding the BET free. You said that only users who deposited 0.001 BTC can withdraw the earning of free bet. I am just confused if only the users who have 0.001 BTC can participate to the free bet, or the users can only withdraw the profit from free bet if they have a minimum 0.001 BTC deposit?

Freebtc button on my account is not there (this happens several times do not know the cause)
My experience used their faucet, you can do 3x claim and after that have to do a bet with min odds of 1.4 and after that can return to claim faucet. Regarding "The total stake is more than your balance." this message is also often experienced when I want to use the max button to place bet, just reduce it slightly from the number of satoshis that you will use to bet, don't forget if you want to make withdrawal you need to make 0.001BTC deposit and place all the deposit amount in certain odds.