There are very few resources available on how to monetize or close source Anki, some reasons: (I’m not related to the official Anki or mod)
Much of Anki’s resources are developed by kind volunteers who provide them for free. Volunteers prefer open source and want users to be able to use it for free. Typically they dislike monetization, paywalls, and closed source, so they neither develop nor provide resources for closed sourcing or monetization. Rather many Anki users consider monetization unethical and often oppose it.
Legally monetization is possible because the license permits anyone to freely use the code including monetization, so there are already projects that have been monetized in this way. But how this is done is generally not made public because developers working for profit have no interest in open sourcing or contributing. Such motives do not exist for them because disclosing their methods would increase competition and reduce their profits. It’s likely that the official Anki is partially the same, if they released all the code there’s a risk they wouldn’t be able to operate so AnkiWeb and iOS are closed source.
So basically only non profit volunteers can receive support for resources and methods within the Anki community for now. There is no support for developers who charge fees or use closed-source development so they’ll likely need to research and develop on their own.
There are occasional requests from teachers at mostly non profit schools but Anki is optimized for individual use and not for organizations so there aren’t many resources available for them. There are some discussions about school and Anki in this thread.
AnkiForums thread: Anki in schools