As a past identity theft victim, I am also concerned about security. After a quick search prompted by your comments, I was unable to locate any un-patched security concerns or any instance of identity theft attributed to Tapatalk. Although I disagree, I'm sure TPT has reasons for the removal of Tapatalk however - I don't believe it appropriate to alarm users with seemingly unfounded concerns about security.
+1. SNS users virtually always use Paypal; there's no reason for financial transaction information to pass through Tapatalk.
I'd be willing to bet loss of ad revenue is the biggest complaint sites have against Tapatalk.