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For anyone who has suffered because they can't watch All-In in their country...
I can't promise this will work everywhere, but from the US I was able to watch both seasons by using NordVPN, connecting to Belgium, and using an incognito chrome window (incognito wasn't always necesssary but if you want to avoid the panic of it suddenly failing, I'd just do it).
I can't take credit for this fix. I found it in a reddit comment from a year ago after an hour of trying to make my ExpressVPN work with amazon (it really doesn't).
The documentary was great and definitely worth the extra work.