Business/Office productivity tools can be productive at that rate. Core systems like ERP or arguably CRM can't, but MS Teams is probably already that low, Figma, Canva and several others could absolutely afford to be one nine before it affects their churn materially. I suspect OpenAI and Anthropic make most of their profit on business use cases rather than dev use cases (likely higher revenue but less profit) so this may be what sets the standard of uptime.