Hosting is not the problem that generates the need for a business. The problem is having people available to do the work that is needed to keep the system usef

Hosting is not the problem that generates the need for a business. The problem is having people available to do the work that is needed to keep the system useful and up-to-date, which includes writing code that will parse the ToS, maintaining it, and upgrading programming languages, packages ... and most probably lawyers. So where those diffs are hosted is a tiny cost of what is needed to make it work. All these require effort. And effort can be paid with one of two things: time and money. And for someone to have time to work full-time on this, they need to have ... money to sustain themselves. Thus this kind of project needs money => that either can be a grant, donation from a big entity, or business model. Donations from users are not working for long-term sustainability in most cases of good projects for society. Or at least I don't know a successful project like this.