I can name Coindragon for example that did a signature campaign but eventually they shut down. I think the platform has to be innovative also before they can thrive. If the casino has nothing new to offer like exciting new games, interface or free spins its going to struggle in competition.
The competition now is very stiff newly opened casino will have to struggle to get the attention of players and they have to offer something what old casinos are not yet offering, only a few gamblers are taking the risk to try a new casino, new casinos will have to establish their reputation and this will take a few months before their reputation take off.