User acquisition

The general and ideal user acquisition is of course organic Googling:

user does not understand his teacher's explanation of a subject
user Googles into rare specific subject
looks around, then login/create account with OAuth to leaves a comment or upvote
notice that you can fork anything
mind = KABOOM

However, before that point, it is very likely that Ciro will have to physically do some very hard and specific user acquisition work at some University. Maybe there is a more virtual way of achieving this.

This work will involve going through some open set of university lecture notes, and creating a superior version of them on OurBigBook.com, and somehow getting students to notice it and use it as a superior alternative to their crappy lecture notes.

Another very promising route is publishing the answers to old examination questions on the website. It is likely that we will be able to overcome any copyright issues by uploading only the answers to numbered questions. There is a minor risk that these would be considered derivative works of the copyrighted questions. But universities would have to be very anal to enforce a DMCA for that!!!

www.reddit.com/r/learnmath/comments/lj12pg/problem_sets_and_solutions_equivalent_to/

Getting in contact with students is an epic challenge, as an incredibly deep chasm separates us:

it is basically impossible to try and approach teachers: how to convince teachers to use CC BY-SA
and on the other hand, how will you get university students to trust you are not a pedophile and that you actually want to help them?
The missing aspect is how to join their main "class communication group", e.g. a WhatsApp or Discord chat they have. That would be the perfect entry point to communicate with the end users. But that entry point is also generally closed exclusively for students, and sometimes lecturers, and will not accept anyone external.
Perhaps Ciro would be able to do something with one of the two Universities he attended in the past: École Polytechnique or University of São Paulo. But there was no clear channel in those institutions for that. There is either an "infinitely noisy Facebook with everyone that bothered" or silence, deathly silence and isolation of no contact. The key hard part is getting a per-course granularity chat. Discord Student Hubs are a fantastic initiative in that area. Shame that Discord is an unusable mess with zero ways to select which notifications you care about: Section "Discord email notifications"!
One approach method that shows some promise is to follow the Student societies, which often host open events of interest outside of work hours.

Walking with advertisement t-shirts mentioning specific course names in some university location is something Ciro seriously considers, that's how desperate things are. Watch out: docs.ourbigbook.com/#public-relations for T-shirt news!

User acquisition

 Ancestors