This site just fast. Not fun and fair. Because,
1)Not give welcome bonus and say:Sportsbet.io reserves the right to make amendments or cancel the promotion at any time.
2)A csgo match resulted default, not played. And bet not refunded i lose.
3)İm bet a match and win but its cancelled. Because match added wrong category.
4)İm cashed out 2 bets but they dont give offered amount and say not issue found, odds changed. İf odds changed cashout will cancel. But not cancel and my money missing.
And livechat never help you.
Sportsbet.io is one of the best sportsbook available out there and everytime I've had a problem with them it was resolved so I don't understand why exactly do you say this is not fair.
1) If you have respected all the rules then it's your right to receive the welcome bonus as long as the promotion is still running, and it does as I can see on their website.
2) You should do some research and see what a sportsbook will do in case something like that happens. Some rules are fixed and they apply to every sportsbook while some sportsbooks have their own rules created for certain events. The same thing happened to me, my bet was finalized as lost but after I contacted the support team they resolved the problem and the event was voided so I received odd 1,meaning I got my money refunded.
3)Again, this happened either because it was an error from their system or because they have different rules regarding that event. Contact them and ask for proper explanations if you feel something is not fair
4)Odds could change every second, especially if we are talking about events where the score can move very quickly. When odds change your bet, or in your case cash out automatically gets canceled and you have to confirm again your action. This is happening because odds could dramatically change in a matter of seconds and they want to prevent you from losing more money. I don't understand what you mean when you say that your money is missing because that's impossible.
It seems like you have some problems understanding some things, especially rules when talking about sportsbooks. When you have a problem the best thing you can do is contact live chat because they will help you however they can and if necessary they will transfer your inquiry to a higher and more specialized department that can solve any of your problems.