We should invest only in real sites like so many of them nowadays give fake offers, according to me on sites are better than new and undeveloped websites as they run only to get profit not to attach investors. I belives in safety and that comes from well known and well development sites as all those offers I already have been taken from old sites so old sites are more safe and we will not worry about its legality.
Those welcome bonus in newer websites can also be true. I'm not telling that all of them are legit but some of them are running the business for real and truthful as they compete with the older ones.
But the trust factor and meter for them is no longer favorable because of the new casinos that have an agenda to scam users. That's why some gamblers already have a thought that if it is a new casino, higher chance that it's not legit.