The question is what you do with the e-mail address. e.g., if the page would say:
1. "we provide this book for free, but collect your e-mail to follow up once in about 1 month time with a relevant offer." ==> this might even work from a "legitimate interest" view, but thats currently not well defined
OR
2. "click here to provide consent for us collecting your email and using it for ..., ..., ..."
Agree: I have similar performance issues with Google Inbox. E.g. I'm unable to attach files sometimes, and the interface is terrible. Still, I've switched to the new FF as my browser of choice and with the exception of those few sites it's great
As dukeflukem said below, Iceland and Finland probably have very different aspects driving up gun ownership (rural populations hunting, vs self-defense).
An issue with the provided list is that these countries are all relatively poor. As for something that stood out for this list for me: inequality. i.e.: with the exception of Kazakhstan and Kyrgyzstan, all the Gini coefficients are above 35% (with the US (41%) being most similar to Turkey/Turkmenistan/Ukraine (41%/43%/41%). Compare that to Iceland and Finland (26%, 27%)
1. "we provide this book for free, but collect your e-mail to follow up once in about 1 month time with a relevant offer." ==> this might even work from a "legitimate interest" view, but thats currently not well defined
OR
2. "click here to provide consent for us collecting your email and using it for ..., ..., ..."