Idk. I haven't used forks or unofficial clients. But Spotify download bots would show a copyright restriction pop up on the google play version while in the version downloaded from the official website I could use the bots with no problem.

If you got a PC. You can maybe use the Desktop client. Maybe Telegram web works on Macs, too.

Telegram Web A might be your next best solution. Though not a native app. https://web.telegram.org/a/

There's a fork called Swiftgram, they might have left out the content restrictions in their App Store build. If not, you can try building the .ipa from source and sideloading it using AltStore.

Nothing that I am aware of.

Buying a membership may go against the spirit of the post and the community, but Anna's Archive is a very worthwhile cause and you get faster downloads without waiting.

If that's not an option, they have torrents for chunks of their collection as far as I understand. Costs nothing but bandwidth and seeding helps keep the archive safe.

Anna's Archive also provides links to outside links, you can use those whenever they're available. Also there is one server that doesn't make you wait, it's really slow but that's not a big deal for epub files.

#ebooks channel on irchighway afaik

https://github.com/aghayes/rusty_book_pirate/ don't know if this still works as it hasn't been updated in 4 years but might wanna give it a try

#bookz on undernet is what I've used in the past.

#ebooks on irchighway.net

They also have a request service on cerealbox.net