The issue isn't about what's "right and proper" - it's a risky decision to do business with a company with this business model. Even if it's not "wrong" it's better value for a business to work with other businesses that treat them as a valued customer and not as replaceable fodder to fund an unsustainable valuation.

If Stripe want to sacrifice customer experience to chase a higher valuation that's their prerogative. But their current investors better hope they can cut and run before the core business substantially declines.