Sometimes the promotions by the new casinos are so attractive that it's hard to ignore them. In that case if you are going to take the risk it's better to deposit very small amount of money in those casinos. Personally I will advise everyone to play under trusted casino and deposit at a new casino only if they have enough evidence of positive feedback for that casino.
It's normal to see promotions from new casinos that are really interesting and make us feel curious to take them. I think we can try to take the promotion but if using more money to get the bonus, we should just ignore it. We can look for other casinos that do not require a large deposit or some terms and conditions may burden us. It is true that we should deposit money at a trusted casino because at least they already have a reputation among other casinos.