- Charging to bypass the (admittedly very reasonable) rate limits on the main appview
- Providing paid hosting tiers for private git knots, high traffic git knots, git LOP knots, CI runners/spindles, web page hosting (via their github pages equivalent), etc
- Introducing a paid-for and permissioned nix binary cache platform since their CI spindle system is already nix-first.
- providing paid PDS hosting for corporate/business customers with SSO integration etc.
- SLAs and support contracts
There's enough options here that they have a pretty flexible path towards profitability.