The reward they got for their contribution is proportional to its value.

Sorry bro, but that's nonsense. Having an idea does not create wealth. And in the case of Gates, he didn't even have the idea. There is no other method to create wealth than transforming nature through labor.

Its so huge that you can safely say the World before Amazon/Windows/iPhone and the World after A/W?iP. They literally changed the World.

Wrong again. There's a world before the internet and one after internet. Internet is created wholly through public funding, with tax dollars. All technologies used in the iPhone were created like that too.

You picked the wrong billionaires to shit on.

Nope, these will do just fine.

And besides: everything, and I do mean everything you say here only counts 1 kind of "value", which is the biggest problem to begin with. Men get payed more than women because they're the traditional breadwinners. Why? Because the women stayed at home, running the family; dad was able to go out to work because the women had an unpayed job at home. Capitalism has the nasty habit of not counting the wealth that's not measured in dollars. That, in a nutshell, is why you'll never be able to defend capitalism, because it's indefensible.

Getting wealthy by destroying companies and lives of their employees.

Sigh... That's exactly how money is made and true wealth is destroyed, and almost all publicly traded companies work this way. Meritocracy does not exist, not in the real world, if it did, housewives would be payed the same as their husbands who simply worked in another location. Now capitalism has forced the mothers, fathers and their education-craving children to do dad's job; there's that destruction of true wealth again.

I'm pretty sure that you're using/having one of the services/products that those three put on the market. I'm willing to take that one step further and claim that you're pretty satisfied with their products and services. And I'm 100% sure none of them forced you to hand them your money. You did it gladly.

I won't even grace this with a response and just say that this is the same kind of argument as "if you don't like it here, just move elsewhere"; that's a very poor argument to make.