Legal? Likely not, as you’re turning one copy into two copies.
Would anyone pursue you? Likely not. No one is going to get a warrant to search your devices to see if you’ve photocopied your books before giving them away; unless you’re sharing the digital files publically.
Do not share the digital files publically, as that is definetly not legal.
I don’t think a country could blanket ban every email provider that doesnt take emails as it’s an open protocol; anyone can host an email server within seconds.
But you can use another lemmy instance that doesnt ask for email. It will mostly work the same way. You can also see the post contents of groups through other social media that uses ActivityPub (like mastodon)