This may sound ridiculous, but if you peel the backing off and then stick the decal on your shirt or pants 3-4 times, there is a layer of lint that will allow it to peel off easily. As long as I have been doing that, I have had no issues removing them from windshields.
Anecdotal evidence, but I have multiple friends who have been extremely gun-shy about EVs who LOVE the Scout and are only willing to give it a shot because of the extended range. It feels like a natural bridge for those who are hesitant to try new auto tech or suffer from range anxiety.