They asked me for my email address so they could send me a 'personal invitation' to download the app, but when I refused they were miffed.
Same here. My answer was thanks but no thanks, after all the creators of that app stated they were not doing it with the backing of jay double you dot org and it was not endorsed by that website so in "obedience" to governing body orders about using websites not endorsed by the governing body I declined to download anything from that site. You would have thought I had offered one of their first born to Dagon or Chemosh something.