I think there are still some gambling places that still can't be fair because usually the fair possibility posts are only on or in front of the gambling site's website but sometimes they insert an encryption script that makes enemies often lose.
Yeah of course, gambling for others is business even some uses gamblingn platform to scam. If you can visit the reputation section then you can see few gambling platform with bad reputation.
There are gambling platform that welcome you with hug bonus as sign in bonus in joining their platform. Before yo can withdraw you are ask to play the game and of course win that game. However, when you will going to withdraw the bonus and the winning profits of the game the dev will going to ask a processing fee like some sort of btc to deposit before one can withdraw which shows that this activity is clearly a scam activity. Why would ask for a certain deposit before one can withdraw? why not deduct it to tye funds to be withdrawn?
when there are gambling places that do like that they usually have a minimum amount of withdrawal so that maybe this feature can impose restrictions on players to make small withdrawals and only make large withdrawals, until now there are some gambling places that apply it. one of them is Fortunejack which provides a minimum withdrawal limit but has very high confidence.
My advice is when you want to choose a gambling place, then you have to see some of the information in this forum or you can also post to the announcement thread from the gambling website that you can search at
https://bitcointalk.org/index.php?board=56.0 , after that you can read one by one the very important information you can get from there.