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Does algorithm really matter? It's not just the crash game that usually has low values and less possibility of winning, it is also in every game in gambling, and in any platform. But I don't think that Roobet uses the old algorithm as there are already huge number of players that win a big amount in playing Roobet's crash game. And how are you even sure that they are using RHavar's code and not their own? I think only those famous betting platforms with crash games back then only uses that, and new innovating ones are making their own adjustments with the code.
Algorithm is important, because you'll know how the game works. You'll know a lot of things that could help you to verify how many percentage of winning you have in a certain gambling game. Also, I don't know how they found out the algorithm of a game since gambling sites would never make it public, unless someone from inside made a leaked information about it. Knowing the code or algorithm make a game boring, since everyone knows the secret.