In most of the scenarios, if GitHub Actions is down for an hour, even a couple of times per year, the deployment of new functionalities may be delayed a bit but that's it.
If you average over the year, the productivity gain, simplicity, and price (100% free for public repos!) from using GitHub Actions is still worth it for most of the people.
There could have been many uncontrollable reasons for the flow of developers to be interrupted (meeting, lunch, questions from colleagues, a pet in the office, slow internet, traffic with the car, stuck in an elevator) or just big news-related distractions (Christmas, Gamestop stock, Roblox IPO).
Unless you have a company somewhat relying on GitHub Actions for critical / business-generating flow (this sounds like an unusual idea to me but ok), it's unlikely to impact the income of the company.