I appreciate being able to pay for a service I rely on. Using self-hosted runners, I previously paid nothing for Github Actions — now I do pay something for it. The price is extremely cheap and seems reasonable considering the benefits I receive. They've shown continued interest in investing in the product, and have a variety of things on their public roadmap that I'm looking forward to (including parallel steps) — https://github.com/orgs/github/projects/4247?pane=issue&item....

Charging "more than nothing" is certainly not what I would call maximizing revenue, and even it they were maximizing revenue I would still make the same decision to purchase or abandon based on its value to me. Have you interacted with the economy before?