Different game modes are harder or easier depending on the game. And don't get started on how they all fit into different playstyles for different people. While this is true, keep in mind that some games like survival games has way more people than micro minigames... I believe that 100 wins in any game mode will be quite the easy task. I'm sure there are a lot more people who have over 50 wins than you might think...
I also believe that 50 wins doesn't separate the good players from the bad players... If you play the game long enough, no matter how bad you are. Even without getting a single kill, it is still quite possible to get 50 wins, whether it be from people walking off the map, or taking pity on you. I say that 100 wins is the "low-end" of players, but do keep in mind that it doesn't mean that all the players above 100 wins are good.
Even so, player's might miss out on some things or be isolated, mistreated, or even bullied if they aren't able to unlock the 50 wins. There are some competitive things sort of like this that have been done before, however these are more tasks specified for people who feel up to the challenge. When you set the bar at 50 wins, not only is it low, but some people who aren't able to achieve the base wins for that lobby might be left out.
I would go on, but I feel I've made my point. Once again, if you feel like this is an addition that should be applied to Cube Craft, please do suggest it using the following link:
https://www.cubecraft.net/forums/suggestions/