Why do I get max 100 coins a day?

I have been using cashwalk at iphone since a few years.

Why do I get max 100 coins a day even though I walk more 10,000steps?

My friend can get more 100 coins by walking more 10,000 steps. He is using  cashwalk at Android phone.

And I get to know that  amount of coin that I can get reward is also different.

He got $5 from 3000coins.

Very Unfair !!😡