Crab mentality is the term in the Philippines but it is an attitude that was given to a Filipino . It is the attitude of reaching the top while pulling the others down. The idea of "If I can't have it neither can you."
It is called as Crab mentality because this attitude is just like the attitude of a crab in a bucket. The crab doesn't want the other crab to be on the top of the bucket. The crab doesn't want to be left behind. The crab will pull down the other crab that is on his top. At the end they will all die.
This attitude was address to Filipino, It is sad but somehow it is true that some of the Filipino hate to see others success when they are left behind. They will find ways to ruin the success that other people have.
This kind of thingking should not practice in Steemit. In steemit we need "Unity" we should help each other to be successful. We should always keep our feet on the ground in making a valueable post. We need to unite in reaching our goals.
Here in Steemit we will reach success by lifting others. I think that is the best purpose of and platform of this. We can all have success by helping each other. It is just like what 
In Steemit we need to help each other grow. We can unite and work as one to wide spread Steemit. The more member that the community have the more can experience the benefits of it. Off course when times bring us to success don't forget where we started help the newbie help the people in the community especial those who are in need.
We should be happy if we see that someone is doing great and earning a lot don't be envy just keep in mind that you can be like them. All you have to wait. Use your knowledge well and apply all the learning that you've learn from your colleague in their blogs. Don't be greedy and selfish. Just make them as an inspiration to create a meaningful and valuable post. Always think if they are successful they can help a lot in the community and specialy those who needs help to grow and earn.