Agreed - but none of this supports your proposition that capitalism means you get a reward that is proportionate to how hard you work.
By and large, capitalism rewards those who are best placed to work its systems.
The bit about 'hard work' is a lie. Everyone knows the essential workers - finally recognised as essential during the pandemic, yet still not paid extra - work a hell of a lot harder than white-collar bods with comfy salaries and pension plans.
Going further, you might have noticed that media like the Economist, the FT, Times, etc are saying Britain is now an 'inheritocracy'. This makes society even more unfair - if your parents weren't in a position to make capitalism work for them, you're at such a huge disadvantage you're unlikely to ever catch up. You can't redo your parents, so that's really quite the trap no matter how hard you work.
... And the people with the comfy jobs, whose parents paid their house deposit and who will inherit enough to see their own children well set up, still need cleaners and carers and deliveries, etc. Who are still paid so little that they literally can't live on the wages, despite working so hard that their backs are fucked before they reach 60; who will inherit little and leave even less.
I've got nothing against a stratified society. I do, however, believe in collective responsibility and social mobility. Those two concepts are now seen as borderline communist, therefore a Bad Thing.