[robin_reala]

We have minimal hosting costs (ebooks are small) and no software costs, so the rest is just down to time. Luckily, the majority of the process is proof reading, which it turns out people quite enjoy doing regardless, and is easily parallelisable our across multiple contributors.

So so far not need for contributions, and it makes things simpler to not need them.

[StavrosK]

If your hosting costs ever mount, I can recommend Hetzner for hosting, they'll give you a whole bunch of bandwidth for free on their smallest plan ($3/mo) and you can even buy a 3 Tb pipe (IIRC) you can saturate for $20ish a month.

Otherwise, I'm sure some organization will be happy to provide some bandwidth in exchange for a shoutout.