I don't know if anyone is using this app, XDA just posted this on their FB page:
Themer
26 mins (ago)
Alert: Some people are seeing a message on Android (attached), warning that Themer can trick users into entering personal data. We can assure you that we *are not* doing this, and that this issue is related to Google's new Verify Apps feature rolled out on April 14. We will be working with Google and with our own developers to fix this error. Sorry for the inconvenience. If you are experiencing this issue, any additional information you can send to us will be helpful. Send it to support@themerapp.com.
Themer
26 mins (ago)
Alert: Some people are seeing a message on Android (attached), warning that Themer can trick users into entering personal data. We can assure you that we *are not* doing this, and that this issue is related to Google's new Verify Apps feature rolled out on April 14. We will be working with Google and with our own developers to fix this error. Sorry for the inconvenience. If you are experiencing this issue, any additional information you can send to us will be helpful. Send it to support@themerapp.com.