They run a service: they could impose limits on the number of submissions, builds, branches, scans, etc, and give additional usage credits to the large community projects they want to encourage.
The LLM revolution has proven that if you have enough institutional investors, the Berne Convention doesn't apply to you, but it's sofar unclear whether that exemption from international law extends to small EU-based non-profits.
They're not a free for all, they do KYCP (know your customer's projects) with an initial assumption of good faith.
Also they're a voluntary society you can join by contributing money. They're not a charity as such, more like a group of people pooling resources, and also offering them to people outside the group on a good faith basis.