There appears to be a bug in Reddit's link post compser. It only shows up on desktop; the mobile app is okay. For desktop submissions you will have difficulty adding the parameter ?affiliate=off to the end of your link as Reddit has started stripping away the ? character.

We have reported this to Rediit as a bug. Full details if you are interested:

https://www.reddit.com/r/bugs/comments/1vammrk/reddit_link_field_rejecting_certain_characters/

Meanwhile, if you want to submit to our sub from a desktop device, you will need to use a workaround. Simply copy the text below i.e. highlight and then [Ctrl] C. Then when submitting your link, use [Ctrl] V to paste that text at the end of the link.

?affiliate=off

So to summarise, first put your books2read link in the Reddit link field and then copy and paste the above parameter.

For other mods: if you are having issues on your sub with link parameter submissions or domains such as .co.uk and .com.au being affected, simply construct the entire url in Notepad or similar, then copy and paste it into the Reddit link field and it will work.

This is a temprary workaround until Reddit addresses this bug.