It's more complex than this but yes, allow smaller competitors to exist long enough to compete by offering similar enough products as a large, evolved ecosystem/platform provides, as to eventually have competition in place to keep fees/how much they extract from society in check.

I didn't argue Stripe has a monopoly but even ogilopolies once mature enough are problematic.

Also of you're trying to argue VCs make investments in companies that ultimately make good decisions for society vs. self-interested - then I disagree.