I'm not aware there is such a list. Logically it's mostly small countries where they speak their own languages where no big corporations that produce ads have any interest in. You probably will find some comment like mine where they mention certain countries but this can always change any day. Sometime there is a single advetiser in a country but even then you will see their ad much less frequently than the common US/English based ads.
I can recommend you the Nord Vpn Firefox addon which allows you to only use vpn for certain domains which would be anything with *.twitch.tv
Well just recently researchers discovered a campaign installing backdoors on iPhones using a chain of several 0-day expoits or in this case using also 0-click exploits, where no interaction from a user is needed. However those attack chain are so advanced that practically normal law enforcement would never be able to do it. But theoretically yes some well equiped state actors are able to infect you without noticing. If you are really intrested to see how advanced these attack are search for "project triangulation" or watch the recording from last years chaos computer conference: https://media.ccc.de/v/37c3-11859-operation_triangulation_what_you_get_when_attack_iphones_of_researchers#t=373