The alternative to immigrant minimum wage strawberry pickers is native born strawberry pickers who would demand significantly higher wages. The capitalists get rich by selling more strawberries at a lower price. It can be both bad for native born strawberry pickers as well as good for consumers. But there are few native born strawberry pickers who have a political voice. Substitute strawberry pickers with software developers, and now you’re talking about the native born HN crowd.
In a capitalist organization, by definition the capitalists take the productive output from the workers, and sell it, pocketing the difference, and deciding dictatorially how to distribute the revenue. So yes, by definition they are grifting off of the workers.
Capitalists don’t get rich stealing from workers. The get rich improving the lives of consumers.