Alex; we've seen some users make use of various URL shortening tools offered by their respective corporate masters. See for instance this post
https://www.mobileread.com/forums/sho...1&postcount=17 that describes some of the Amazon and Google corporate tools (and browse the thread that message is in
Gifting Kobo eBooks?) to see some of the "discussions" that ensued.
Any chance of documenting these as legal options?