You're likely to run into domestic Controlled Foreign Corporation rules. Basically if you or your family own a large portion of a foreign registered company and that company is taxed less than domestic tax rates, it'll be classed as actually residing in your home country for corporate tax purposes.
Why will anyone trust something based/developed in the USA related to security? It's a compromised jurisdiction. For anyone creating security products who wants to be credible will need to be based somewhere that respects privacy.
Jersey (Channel Islands) is working on becoming a focus point for technology investment and startups. While technically it's not part of the EU, it is part of Europe. There's very low taxes and gigabit fibre is being rolled out too.
So true. I added code to ask regular users to rate the app and received a lot of 4/5 star reviews. Ask happy customers and they'll willingly give your app a good rating.