Good question. I think the folks at Fly realize that they get a lot of benefit from enabling open source projects that work well on their platform. They have a somewhat similar approach with the Phoenix project in that they hired Chris McCord to work on it full-time.

Litestream has a lot of potential in being a lightweight, fast, globally-distributed database and that aligns really well with Fly. Continuing to release it as open source means more folks can benefit from it and give feedback -- even if they don't use it on Fly.