I think it's fair to "trade" an email for a good learning resource. I mean, I'm not ok with the "3 pages ebook marketing BS leadmagnet " but it's not the case here.

A way a lot of people deal with this is to have a compulsory email box but do very minimal validation. For beginner focused content, people who know they can put a fake email and don't want to be on your mailing list are not much of a loss. And if the content is good, they might still recommend to others who will join the mailing list.

Note: those using the Privacy Badger extension won't see the email form on your website.

Thanks :) It's probably also better for you, since you avoid people that would use bogus email adresses.