Capitalism just means private citizens can own the means of production (e.g. start a business, buy stock) and earn a return on investment. It doesn’t mean only the rich must get richer. It means anyone who saves and invests their money instead of spending it gets richer.
However capitalism is perfectly compatible with a progressives taxation system such that the rich get richer at a lesser rate than the poor get richer.
>anyone who saves and invests their money instead of spending it gets richer.
You realise that a large swathe of society earn less than their costs?
Everyone will get richer perpetually, there will never be any impact on climate, we'll never suffer water shortages, we'll all ride unicorns and eat rainbows...
The important thing to note here is people have been propagandized into thinking that capitalist = democratic. In fact the US would gladly punish you with 'un-American activities' investigation if you said anything to the contrary.
The thing is a capitalistic country will gladly turn itself into an authoritarian one if both wealth becomes concentrated and wealth buys votes. With the massive rise in authoritarian activities all over the world, especially in the US our democratic system is at very high risk of collapsing.